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' ClaytonEdna Murphy
Natalie Van CleefFrank Lackteen
Dr. ViningBradley Barker
Bert MooreHarry Semels
Ivan InvanovitchPaul Porter
Paul Mannering, The EmperorTom Goodwin
Police Inspector Cabot