diff --git a/src/pyj/read_book/search.pyj b/src/pyj/read_book/search.pyj
index 783efc7f3a..519a028356 100644
--- a/src/pyj/read_book/search.pyj
+++ b/src/pyj/read_book/search.pyj
@@ -28,6 +28,33 @@ add_extra_css(def():
 )
 
 
+def get_toc_data(book):
+    spine = book.manifest.spine
+    spine_toc_map = {name: v'[]' for name in spine}
+    parent_map = {}
+    toc_id_map = {}
+
+    def process_node(node):
+        toc_id_map[node.id] = node
+        items = spine_toc_map[node.dest]
+        if items:
+            items.push(node)
+        children = node.children
+        if children:
+            for child in children:
+                parent_map[child.id] = node
+                process_node(child)
+
+    toc = book.manifest.toc
+    if toc:
+        process_node(toc)
+    return {
+        'spine': spine, 'spine_toc_map': spine_toc_map,
+        'spine_idx_map': {name: idx for idx, name in enumerate(spine)},
+        'parent_map': parent_map, 'toc_id_map': toc_id_map
+    }
+
+
 class SearchOverlay:
 
     def __init__(self, view):
@@ -90,7 +117,11 @@ class SearchOverlay:
     def clear_caches(self, book):
         if self._worker:
             book = book or current_book()
-            data = {'book_hash': book.book_hash, 'stored_files': book.stored_files, 'spine': book.manifest.spine}
+            self.toc_data = get_toc_data(book)
+            data = {
+                'book_hash': book.book_hash, 'stored_files': book.stored_files, 'spine': book.manifest.spine,
+                'toc_data': self.toc_data
+            }
             self.worker.postMessage({'type': 'clear_caches', 'book': data})
 
     def onkeydown(self, event):