Gentleman crook Boston Blackie answers a want ad for an expert safecracker placed by Doris Macon, who claims a moral right to the safe's contents. She hires Blackie, and they break into the house where the safe is kept. Blackie blows up the safe just as owner Captain von Hoffmeier returns home. Doris disappears with papers from inside the safe, while Blackie takes phonograph records, which, when played with a special needle, reveal secrets that implicate von Hoffmeier as a German political spy.
Priscilla Dean
as Doris Macon
Ashton Dearholt
as Robert Melchoir
Sam De Grasse
as Boston Blackie
Sam Appel
as Michael Delano
Lillian West
as Mary
Fred Kelsey
as Capt. von Hoffmeier
