DC comics capstone books are so much fun! I did a search for Halloween versions for Hallowreads and found this book. The story centers on Barbara Gordon who is invited last minute to her crushes big Halloween party, but she has promised Bruce she will keep an eye on Tim Drake.
Then Barbara gets the idea to take Tim with her. The pair take advantage of Halloween night to show up at the party in full costume. Unfortunately for the party host he has a very expensive cat statue on display, one Catwoman can't resist.
With Batman off on other crimes its up to Barbara and Tim to save the day without exposing the fact that they are real superheroes. It was a nice change of pace to see the sidekicks in charge. A fun read.