Tim Hanley, an American agent, posing as a lawyer with the United States Embassy in London, and Reggie Oliver, a Scotland Yard detective, posing as a music critic are both keeping their eye on Carla Nillson, a famous singer, whom they suspect of espionage. They all meet in London, then in Lisbon, and eventually in New York City, where Carla sings on the radio.
George Brent
as Tim Hanley
Ilona Massey
as Carla Nillson
Basil Rathbone
as Reggie Oliver
Gene Lockhart
as Sidney Grenner
George Zucco
as Webster
Marjorie Gateson
as Bertha Grenner
Clayton Moore
as Sewell
Francis Pierlot
as Dr. Rowan
Martin Kosleck
as Bruner
Charles D. Brown
as Tetlow
Leyland Hodgson
as Sergeant Moulton
Gordon De Main
as Denby
