Barbara Gordon and Tim Drake are attending a Halloween costume party at Graves Mansion dressed as their secret identities (Batgirl and Robin) when Catwoman strikes, stealing the priceless Black Cat Diamond--but with so many guests dressed up as either superheroes or supervillains the two young crime fighters will have to separate the real villain from her many imitators if they hope to retrieve the valuable prize.

Eric Fein is a freelance author of more than 40 fiction and nonfiction books and graphic novels. His books for Capstone include "Impossible Victory: The Battle of Stalingrad", "D-Day: The Battle for Normandy", and "Weapons, Gear, and Uniforms of World War I".