Madge Clayton, a society girl, mysteriously disappears. The police suspect a master criminal is behind the girl's abduction, but her brother, Bob, and fiancé, Bert Moore, help with the search. They unearth a scheme to kidnap another girl, Natalie Van Cleef, and the evidence takes Bob and Bert to an estate on Long Island.
Constance Bennett
Madge Clayton, his sisterJack Mulhall
Robert 'Bob' ClaytonHarry Semels
Ivan InvanovitchFrank Lackteen
Dr. ViningEdna Murphy
Natalie Van CleefBradley Barker
Bert MooreTom Goodwin
Police Inspector CabotPaul Porter
Paul Mannering, The Emperor