An American officer goes undercover to unmask a Revolutionary War traitor.
Cornel Wilde
as Maj. John Boulton
Michael Wilding
as Maj. John Andre
George Sanders
as Dr. Jonathan Odell
Anne Francis
as Sally Cameron
Robert Douglas
as Gen. Benedict Arnold
John McIntire
as Gen. Robert Howe
Rhys Williams
as Peter Andre
John Dehner
as Nathanael Greene
Bobby Driscoll
as Ben Potter
James Westerfield
as Col. Jameson
Paul Cavanagh
as Sir Henry Clinton
Peter Adams
as Lt. Blair