A master thief, known as "The Bat" due to his cunning disguises, announces a jewel heist in advance, only to be thwarted by a rival crook at the crime scene. The investigation leads to the Courtleigh Fleming estate, now leased by wealthy spinster Cornelia Van Gorder. Complications arise as a reported banker death, a missing young cashier, and a $200,000 bank robbery unfold.
The Bat
A celebrated mystery writer and their guests are disrupted by a chaotic bat-costumed figure at a secluded mansion, where they are renting.