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 Morris
as Detective Anderson

Chance Ward
as Police lieutenant

Una Merkel
as Dale Van Gorder

Richard Tucker
as Mr. Bell

Wilson Benge
as The Butler

DeWitt Jennings
as Police Captain

Sidney D'Albrook
as Police Sergeant

S.E. Jennings
as Man in Black Mask

Grayce Hampton
as Miss Cornelia van Gorder

Maude Eburne
as Lizzie Allen
CinemaSerf
When a diamond necklace is stolen from under the very noses of the police, the perpetrator - "the Bat" - leaves them a note saying they can relax - he is off to pastures new... Shortly afterwards, suspicious things start going on at a country house where a mystery unfolds that leads the assembled gr...