Synopsis
Infamous burglar "The Bat" commits a daring jewelry theft despite heavy police presence. Soon after, a bank theft occurs, which may be the work of the criminal as well. Meanwhile, Cornelia Van Gorder (Grayce Hampton) ]has various people arrive at her old mansion, including her niece, Dale (Una Merkel), a bank employee, and police detective Anderson (Chester Morris). When guests start turning up dead, Cornelia begins to suspect that The Bat may be lurking around the estate.