diff --git a/modules/web_app.py b/modules/web_app.py
index 0bee9ad..f1256a7 100644
--- a/modules/web_app.py
+++ b/modules/web_app.py
@@ -887,6 +887,34 @@ def restart_run(id):
     flash(f"Started new Run #{new_run.id}" + (" with modifications." if feedback else "."))
     return redirect(url_for('view_project', id=run.project_id))
 
+@app.route('/project/<int:run_id>/revise_book/<string:book_folder>', methods=['POST'])
+@login_required
+def revise_book(run_id, book_folder):
+    run = db.session.get(Run, run_id) or Run.query.get_or_404(run_id)
+    if run.project.user_id != current_user.id: return "Unauthorized", 403
+    
+    instruction = request.form.get('instruction')
+    
+    # Create new run
+    new_run = Run(project_id=run.project_id, status="queued")
+    db.session.add(new_run)
+    db.session.commit()
+    
+    # Task: Apply feedback to Bible, Copy all books EXCEPT this one, then Generate
+    task = generate_book_task(
+        new_run.id, 
+        run.project.folder_path, 
+        os.path.join(run.project.folder_path, "bible.json"), 
+        allow_copy=True, 
+        feedback=instruction, 
+        source_run_id=run.id, 
+        keep_cover=True, 
+        exclude_folders=[book_folder]
+    )
+    
+    flash(f"Started Revision Run #{new_run.id}. Book '{book_folder}' will be regenerated.")
+    return redirect(url_for('view_project', id=run.project_id))
+
 @app.route('/run/<int:id>')
 @login_required
 def view_run(id):
diff --git a/modules/web_tasks.py b/modules/web_tasks.py
index 6fcb849..d70d7be 100644
--- a/modules/web_tasks.py
+++ b/modules/web_tasks.py
@@ -36,7 +36,7 @@ def db_progress_callback(db_path, run_id, percent):
         except: break
 
 @huey.task()
-def generate_book_task(run_id, project_path, bible_path, allow_copy=True, feedback=None, source_run_id=None, keep_cover=False):
+def generate_book_task(run_id, project_path, bible_path, allow_copy=True, feedback=None, source_run_id=None, keep_cover=False, exclude_folders=None):
     """
     Background task to run the book generation.
     """
@@ -147,6 +147,10 @@ def generate_book_task(run_id, project_path, bible_path, allow_copy=True, feedba
                 for item in os.listdir(latest_run_dir):
                     # Copy only folders that look like books and have a manuscript
                     if item.startswith("Book_") and os.path.isdir(os.path.join(latest_run_dir, item)):
+                        if exclude_folders and item in exclude_folders:
+                            utils.log("SYSTEM", f"  -> Skipping copy of {item} (Target for revision).")
+                            continue
+                            
                         if os.path.exists(os.path.join(latest_run_dir, item, "manuscript.json")):
                             src = os.path.join(latest_run_dir, item)
                             dst = os.path.join(current_run_dir, item)
diff --git a/templates/run_details.html b/templates/run_details.html
index a6e3852..aac6b69 100644
--- a/templates/run_details.html
+++ b/templates/run_details.html
@@ -170,12 +170,38 @@
                         <a href="{{ url_for('check_consistency', run_id=run.id, book_folder=book.folder) }}" class="btn btn-outline-warning ms-2">
                             <i class="fas fa-search me-2"></i>Check Consistency
                         </a>
+                        <button class="btn btn-warning ms-2" data-bs-toggle="modal" data-bs-target="#reviseBookModal{{ loop.index }}" title="Regenerate this book with changes, keeping others.">
+                            <i class="fas fa-pencil-alt me-2"></i>Revise
+                        </button>
                     </div>
                 </div>
             </div>
         </div>
     </div>
 </div>
+
+<!-- Revise Book Modal -->
+<div class="modal fade" id="reviseBookModal{{ loop.index }}" tabindex="-1">
+    <div class="modal-dialog">
+        <form class="modal-content" action="{{ url_for('revise_book', run_id=run.id, book_folder=book.folder) }}" method="POST">
+            <div class="modal-header">
+                <h5 class="modal-title">Revise Book</h5>
+                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
+            </div>
+            <div class="modal-body">
+                <p class="text-muted small">This will start a <strong>new run</strong>. All other books will be copied over, but this book will be regenerated based on your instructions.</p>
+                <div class="mb-3">
+                    <label class="form-label">Instructions</label>
+                    <textarea name="instruction" class="form-control" rows="4" placeholder="e.g. 'Change the ending', 'Make the pacing faster', 'Add a scene about X'." required></textarea>
+                </div>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancel</button>
+                <button type="submit" class="btn btn-warning">Start Revision</button>
+            </div>
+        </form>
+    </div>
+</div>
 {% endfor %}
 
 <div class="row mb-4">