diff --git a/README b/README
index 0a0cf0a..38aa76d 100644
--- a/README
+++ b/README
@@ -31,7 +31,6 @@ sudo docker-compose -f /srv/docker/config/docker-compose.yml up bookdb_web
 
 ########################################################### TODOS (next 27):
 TODO-09:	show books to buy view / printable
-TODO-12:	show books missing from a series (I own only some of them)
 TODO-13:	show books on wish list
 TODO-14:	show books that need replacing
 TODO-15:	show books I have sold
diff --git a/main.py b/main.py
index 215da45..f00c4c4 100644
--- a/main.py
+++ b/main.py
@@ -654,6 +654,22 @@ def unrated_books():
     books = db.engine.execute("select * from book where rating = (select id from rating where name = 'Undefined') and owned = (select id from owned where name = 'Currently Owned')")
     return render_template("books.html", books=books )
 
+@app.route("/missing_books", methods=["GET"])
+def missing_books():
+    tmp = db.engine.execute("select s.*, count(bsl.book_num) from book_series_link bsl, series s where bsl.book_num is not null and s.id = bsl.series_id group by s.id order by s.title")
+    books=[]
+    for t in tmp:
+        if t.num_books != t.count:
+            bsl=Book_Series_Link.query.filter( Book_Series_Link.series_id==t.id ).order_by(Book_Series_Link.book_num).all()
+            missing=[]
+            for cnt in range(1,t.num_books+1):
+                missing.append( cnt )
+            for b in bsl:
+                missing.remove( b.book_num )
+			# turn missing from array into string, and strip 0 and last char (the square brackets)
+            books.append( { 'id': t.id, 'title': t.title, 'num_books': t.num_books, 'missing': str(missing)[1:-1] } )
+    return render_template("missing.html", books=books )
+
 @app.route("/", methods=["GET"])
 def main_page():
     return render_template("base.html", alert=st.GetAlert(), message=st.GetMessage())
diff --git a/templates/base.html b/templates/base.html
index 210efe4..e6f9201 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -49,6 +49,7 @@
 						<a class="dropdown-item" href="{{url_for('books')}}">Show All</a>
 						<a class="dropdown-item" href="{{url_for('books_on_shelf')}}">Show Books on shelf</a>
 						<a class="dropdown-item" href="{{url_for('unrated_books')}}">Show Unrated_Books</a>
+						<a class="dropdown-item" href="{{url_for('missing_books')}}">Show Missing Books</a>
 						<a class="dropdown-item" href="{{url_for('stats')}}">Show Stats</a>
 					</div>
 				</div class="nav-item dropdown">