Humble stamp dealer Otto Becker has little to do with international politics, so when he receives a surprise visit from his estranged twin brother and Nazi spy, Baron Hugo von Detner, his world is thrown into turmoil. Threatening Becker with deportation, Hugo forces him to use his shop as a front for espionage.
Conrad Veidt
as Otto Becker / Baron Hugo von Detner
Ann Ayars
as Kaaren De Relle
Frank Reicher
as Fritz
Dorothy Tree
as Miss Harper
Ivan F. Simpson
as Professor Sterling (as Ivan Simpson)
William Tannen
as Ludwig
Martin Kosleck
as Kurt Richten
Marc Lawrence
as Joe Aiello
Sidney Blackmer
as Arnold Milbar
Moroni Olsen
as Brenner
Pierre Watkin
as Grover Blaine McHenry
Ernie Alexander
as Sailor (uncredited)
