Catwoman's Halloween heist / Fein, Eric

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.

Batgirl, invited to a Halloween party after already agreeing to stay home with Robin, her younger, crime-fighting partner, decides to take him along to the celebration, and when a prized artifact is stolen from the host's home, the teen superheroes rush to find the culprit.