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 has various people arrive at her old mansion, including her niece, Dale, a bank employee, and police detective Anderson. When guests start turning up dead, Cornelia begins to suspect that The Bat may be lurking around the estate.

Chester Morrisas Detective Anderson
Una Merkelas Dale Van Gorder
Richard Tuckeras Mr. Bell
DeWitt Jenningsas Police Captain
Sidney D'Albrookas Police Sergeant
Grayce Hamptonas Miss Cornelia van Gorder
Maude Eburneas Lizzie Allen