Detective Comics #697

Batman investigates a rash of criminal disappearances, including Two-Face, Charaxes, and others, and uncovers a would-be cop kidnapping Gotham's worst and imprisoning them in his own private maximum security prison.

Characters: Batman, Black Mask, Charaxes, Dick Grayson, Harvey Bullock, James Gordon, Lock-Up, Mackenzie Bock, Renee Montoya, Sarah Essen, Tim Drake, Two-Face