diff --git a/python/ebook_search/api/main.py b/python/ebook_search/api/main.py
index 286e8a7..87e3316 100644
--- a/python/ebook_search/api/main.py
+++ b/python/ebook_search/api/main.py
@@ -36,12 +36,13 @@ async def lifespan(app: FastAPI) -> AsyncIterator[None]:
     app.state.config = config
     logger.info(
         "ebook_search_config_loaded top_k=%s embedding_model=%s embedding_base_url=%s vllm_base_url=%s "
-        "rerank_enabled=%s answer_enabled=%s library_paths=%s",
+        "rerank_enabled=%s phrase_matching_enabled=%s answer_enabled=%s library_paths=%s",
         config.top_k,
         config.embedding_model,
         config.embedding_base_url,
         config.vllm_base_url,
         config.rerank.enabled,
+        config.phrase_matching_enabled,
         config.answer_enabled,
         len(config.library_paths),
     )
diff --git a/python/ebook_search/api/routes/search.py b/python/ebook_search/api/routes/search.py
index c2aa52a..6c7f8a6 100644
--- a/python/ebook_search/api/routes/search.py
+++ b/python/ebook_search/api/routes/search.py
@@ -80,10 +80,17 @@ def search(
     engine: AppEngine,
     query: Annotated[str, Form()],
     rerank: Annotated[str | None, Form()] = None,
+    phrase_matching: Annotated[str | None, Form()] = None,
 ) -> HTMLResponse:
     """Run a search and render HTMX results."""
     try:
-        response = search_ebooks(engine, query, config, rerank=rerank == "true")
+        response = search_ebooks(
+            engine,
+            query,
+            config,
+            rerank=rerank == "true",
+            phrase_matching=phrase_matching == "true",
+        )
     except Exception as error:
         logger.exception("ebook_search_request_failed")
         return templates.TemplateResponse(request, "partials/error.html", {"message": str(error)}, status_code=500)
diff --git a/python/ebook_search/api/static/style.css b/python/ebook_search/api/static/style.css
index 0a74b4e..4644985 100644
--- a/python/ebook_search/api/static/style.css
+++ b/python/ebook_search/api/static/style.css
@@ -181,6 +181,12 @@ textarea:focus {
     flex-wrap: wrap;
 }
 
+.search-toggles {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 14px;
+}
+
 button {
     padding: 10px 20px;
     font: inherit;
diff --git a/python/ebook_search/api/templates/search.html b/python/ebook_search/api/templates/search.html
index 9ae3a43..c86113f 100644
--- a/python/ebook_search/api/templates/search.html
+++ b/python/ebook_search/api/templates/search.html
@@ -9,10 +9,21 @@
         <label for="query">What are you looking for?</label>
         <textarea id="query" name="query" rows="4" placeholder="Ask a question or paste a passage…" required></textarea>
         <div class="form-row">
-            <label class="check">
-                <input type="checkbox" name="rerank" value="true" {% if config.rerank.enabled %}checked{% endif %}>
-                Rerank
-            </label>
+            <div class="search-toggles">
+                <label class="check">
+                    <input type="checkbox" name="rerank" value="true" {% if config.rerank.enabled %}checked{% endif %}>
+                    Rerank
+                </label>
+                <label class="check">
+                    <input
+                        type="checkbox"
+                        name="phrase_matching"
+                        value="true"
+                        {% if config.phrase_matching_enabled %}checked{% endif %}
+                    >
+                    Phrase matching
+                </label>
+            </div>
             <button type="submit">Search</button>
         </div>
     </form>
diff --git a/python/ebook_search/bm25_corpus.py b/python/ebook_search/bm25_corpus.py
index 3a1752b..0450d64 100644
--- a/python/ebook_search/bm25_corpus.py
+++ b/python/ebook_search/bm25_corpus.py
@@ -174,6 +174,7 @@ def fetch_bm25_corpus_records(session: Session) -> tuple[list[dict[str, object]]
         select(
             EbookChunk.id.label("chunk_id"),
             EbookChunk.text.label("text"),
+            EbookSource.id.label("source_id"),
             EbookSource.title.label("source_title"),
             EbookSource.author.label("source_author"),
             EbookChapter.title.label("chapter_title"),
diff --git a/python/ebook_search/config.py b/python/ebook_search/config.py
index b2a7e09..173f07b 100644
--- a/python/ebook_search/config.py
+++ b/python/ebook_search/config.py
@@ -89,6 +89,7 @@ class EbookSearchConfig(BaseSettings):
     protected_phrase_max_candidates_per_book: int = 5000
     protected_phrase_llm_candidates_per_book: int = 500
     protected_phrase_confidence_threshold: float = 0.80
+    phrase_matching_enabled: bool = True
     phrase_hit_boost: float = 0.25
     phrase_min_tokens: int = 2
     phrase_max_tokens: int = 5
diff --git a/python/ebook_search/ingest.py b/python/ebook_search/ingest.py
index 516735d..4111f69 100644
--- a/python/ebook_search/ingest.py
+++ b/python/ebook_search/ingest.py
@@ -13,6 +13,7 @@ import tiktoken
 from sqlalchemy import or_, select
 
 from python.ebook_search.epub_parse import parse_epub
+from python.ebook_search.protected_phrases.lib import index_chunk_phrase_mentions_for_book
 from python.orm.richie import EbookChapter, EbookChunk, EbookSource
 
 logger = logging.getLogger(__name__)
@@ -138,12 +139,14 @@ def ingest_file(session: Session, path: Path, config: EbookSearchConfig) -> bool
             chunk_index = add_chapter_chunks(session, source, chapter, parsed_chapter, chunk_index, config)
 
         session.commit()
+        mention_count = index_chunk_phrase_mentions_for_book(session, source.id, config)
         logger.info(
-            "ebook_ingest_file_complete source_id=%s path=%s chapters=%s chunks=%s",
+            "ebook_ingest_file_complete source_id=%s path=%s chapters=%s chunks=%s phrase_mentions=%s",
             source.id,
             resolved_path,
             len(parsed.chapters),
             chunk_index,
+            mention_count,
         )
     except Exception:
         logger.exception(f"ebook_ingest_file_error path={path}")
diff --git a/python/ebook_search/protected_phrases/lib.py b/python/ebook_search/protected_phrases/lib.py
index aec90b9..08d40bf 100644
--- a/python/ebook_search/protected_phrases/lib.py
+++ b/python/ebook_search/protected_phrases/lib.py
@@ -1249,8 +1249,7 @@ def judge_candidate_phrases_for_books(
             )
             continue
         logger.info(
-            "ebook_candidate_phrase_judgment_book_start source_id=%s book_number=%s books_seen=%s "
-            "title=%r unjudged=%s",
+            "ebook_candidate_phrase_judgment_book_start source_id=%s book_number=%s books_seen=%s title=%r unjudged=%s",
             source.id,
             book_number,
             books_seen,
diff --git a/python/ebook_search/search.py b/python/ebook_search/search.py
index 6e3e8d1..b266c2a 100644
--- a/python/ebook_search/search.py
+++ b/python/ebook_search/search.py
@@ -11,6 +11,7 @@ from typing import TYPE_CHECKING
 
 from pgvector.sqlalchemy import Vector
 from sqlalchemy import literal, select
+from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.orm import Session
 
 from python.ebook_search.bm25_corpus import (
@@ -19,6 +20,11 @@ from python.ebook_search.bm25_corpus import (
     score_bm25_corpus,
 )
 from python.ebook_search.embeddings import MODEL_DIMENSIONS, embed_query, get_embedding_table
+from python.ebook_search.protected_phrases.lib import (
+    HydratedPhraseMatch,
+    detect_protected_phrases_for_query,
+    phrase_hit_counts_for_chunks,
+)
 from python.ebook_search.rerank import rerank_chunks
 from python.ebook_search.timing import RuntimeStep, timed_result
 from python.orm.richie import (
@@ -29,7 +35,7 @@ from python.orm.richie import (
 )
 
 if TYPE_CHECKING:
-    from collections.abc import Mapping
+    from collections.abc import Mapping, Sequence
 
     from sqlalchemy.engine import Engine
 
@@ -45,11 +51,13 @@ class SearchResult:
     chunk_id: int
     text: str
     source_title: str
+    source_id: int | None = None
     score: float = 0.0
     vector_score: float | None = None
     bm25_score: float | None = None
     fused_score: float | None = None
     rerank_score: float | None = None
+    phrase_hit_count: int = 0
     source_author: str | None = None
     chapter_title: str | None = None
     page_label: str | None = None
@@ -64,6 +72,7 @@ class SearchResponse:
     results: list[SearchResult]
     rank_label: str
     timings: tuple[RuntimeStep, ...] = ()
+    phrase_matches: tuple[HydratedPhraseMatch, ...] = ()
 
     @property
     def total_runtime_ms(self) -> float:
@@ -86,14 +95,26 @@ def search_ebooks(
     config: EbookSearchConfig,
     *,
     rerank: bool = False,
+    phrase_matching: bool | None = None,
 ) -> SearchResponse:
     """Run hybrid vector/BM25 search and optional reranking."""
     if not query.strip():
         logger.info("ebook_search_empty_query")
         return SearchResponse(query=query, results=[], rank_label="Hybrid")
 
-    logger.info("ebook_search_start query_length=%s rerank=%s", len(query), rerank)
+    phrase_matching_enabled = config.phrase_matching_enabled if phrase_matching is None else phrase_matching
+    logger.info(
+        "ebook_search_start query_length=%s rerank=%s phrase_matching=%s",
+        len(query),
+        rerank,
+        phrase_matching_enabled,
+    )
     timings: list[RuntimeStep] = []
+    if phrase_matching_enabled:
+        phrase_matches, timing = timed_result("Protected phrase detection", query_phrase_matches, engine, query, config)
+    else:
+        phrase_matches, timing = timed_result("Protected phrase detection skipped", skip_phrase_matches)
+    timings.append(timing)
     retrieval, timing = timed_result(
         "Hybrid retrieval",
         parallel_retrieval,
@@ -111,18 +132,32 @@ def search_ebooks(
         rank_constant=config.rrf_rank_constant,
     )
     timings.append(timing)
+    if phrase_matching_enabled:
+        fused, timing = timed_result(
+            "Phrase mention boost",
+            apply_phrase_mention_boosts,
+            engine,
+            fused,
+            phrase_matches,
+            config.phrase_hit_boost,
+        )
+    else:
+        fused, timing = timed_result("Phrase mention boost skipped", skip_phrase_mention_boosts, fused)
+    timings.append(timing)
     if config.rerank.enabled and rerank:
         response, timing = timed_result("Rerank", apply_rerank, query, fused, config)
     else:
         response, timing = timed_result("Rerank skipped", skip_rerank, query, fused, config)
     timings.append(timing)
-    response = replace(response, timings=tuple(timings))
+    response = replace(response, timings=tuple(timings), phrase_matches=tuple(phrase_matches))
     logger.info(
         "ebook_search_complete vector_candidates=%s lexical_candidates=%s "
-        "fused_candidates=%s returned=%s rank_label=%s runtime_ms=%.1f",
+        "fused_candidates=%s phrase_matching=%s phrase_matches=%s returned=%s rank_label=%s runtime_ms=%.1f",
         len(retrieval.vector_results),
         len(retrieval.lexical_results),
         len(fused),
+        phrase_matching_enabled,
+        len(phrase_matches),
         len(response.results),
         response.rank_label,
         response.total_runtime_ms,
@@ -130,6 +165,77 @@ def search_ebooks(
     return response
 
 
+def skip_phrase_matches() -> list[HydratedPhraseMatch]:
+    """Return no protected phrase matches when phrase matching is disabled."""
+    logger.info("ebook_protected_phrase_detection_skipped")
+    return []
+
+
+def query_phrase_matches(engine: Engine, query: str, config: EbookSearchConfig) -> list[HydratedPhraseMatch]:
+    """Detect protected phrases in a query without making search fail when phrase tables are unavailable."""
+    try:
+        with Session(engine) as session:
+            return detect_protected_phrases_for_query(session, query, config)
+    except SQLAlchemyError as error:
+        logger.warning("ebook_protected_phrase_detection_unavailable error=%s", error)
+        return []
+
+
+def skip_phrase_mention_boosts(candidates: list[SearchResult]) -> list[SearchResult]:
+    """Return candidates unchanged when phrase matching is disabled."""
+    logger.info("ebook_phrase_boost_skipped candidates=%s", len(candidates))
+    return candidates
+
+
+def apply_phrase_mention_boosts(
+    engine: Engine,
+    candidates: list[SearchResult],
+    phrase_matches: Sequence[HydratedPhraseMatch],
+    phrase_hit_boost: float,
+) -> list[SearchResult]:
+    """Boost retrieved chunks that have indexed mentions for detected protected phrases."""
+    phrase_ids = sorted({match.phrase_id for match in phrase_matches})
+    if not candidates or not phrase_ids or phrase_hit_boost <= 0:
+        return candidates
+
+    chunk_ids = [candidate.chunk_id for candidate in candidates]
+    try:
+        with Session(engine) as session:
+            hit_counts = phrase_hit_counts_for_chunks(session, chunk_ids=chunk_ids, phrase_ids=phrase_ids)
+    except SQLAlchemyError as error:
+        logger.warning("ebook_phrase_boost_unavailable error=%s", error)
+        return candidates
+
+    if not hit_counts:
+        return candidates
+
+    boosted = [
+        replace(
+            candidate,
+            score=candidate.score + (hit_counts.get(candidate.chunk_id, 0) * phrase_hit_boost),
+            fused_score=boosted_fused_score(candidate, hit_counts.get(candidate.chunk_id, 0), phrase_hit_boost),
+            phrase_hit_count=hit_counts.get(candidate.chunk_id, 0),
+            rank_source=phrase_rank_source(candidate.rank_source, hit_counts.get(candidate.chunk_id, 0)),
+        )
+        for candidate in candidates
+    ]
+    return sorted(boosted, key=lambda candidate: candidate.score, reverse=True)
+
+
+def boosted_fused_score(candidate: SearchResult, phrase_hit_count: int, phrase_hit_boost: float) -> float | None:
+    """Return a fused score adjusted by phrase hits when a fused score exists."""
+    if candidate.fused_score is None:
+        return None
+    return candidate.fused_score + (phrase_hit_count * phrase_hit_boost)
+
+
+def phrase_rank_source(rank_source: str, phrase_hit_count: int) -> str:
+    """Append phrase evidence to a rank-source label when a chunk was boosted."""
+    if phrase_hit_count <= 0 or "phrases" in rank_source:
+        return rank_source
+    return f"{rank_source} + phrases"
+
+
 def parallel_retrieval(
     engine: Engine,
     query: str,
@@ -223,6 +329,7 @@ def vector_candidates(engine: Engine, query: str, config: EbookSearchConfig) ->
             select(
                 EbookChunk.id.label("chunk_id"),
                 EbookChunk.text.label("text"),
+                EbookSource.id.label("source_id"),
                 EbookSource.title.label("source_title"),
                 EbookSource.author.label("source_author"),
                 EbookChapter.title.label("chapter_title"),
@@ -317,9 +424,11 @@ def reciprocal_rank_fusion(
 
 def search_result_from_row(row: Mapping[str, object]) -> SearchResult:
     """Convert a database row mapping into a search result."""
+    source_id = row.get("source_id")
     return SearchResult(
         chunk_id=int(row["chunk_id"]),
         text=str(row["text"]),
+        source_id=int(source_id) if source_id is not None else None,
         source_title=str(row["source_title"]),
         source_author=optional_str(row["source_author"]),
         chapter_title=optional_str(row["chapter_title"]),