When a reporter is killed under mysterious circumstances, the political cartoonist on his paper begins to investigate on his own. He finds that a vengeful industrialist may be trying to manipulate an international peace conference to stage a bombing attack on London.

Charles Farrell
as Briant Gaunt

Margaret Vyner
as Mary Stevens

Fritz Kortner
as Minister Peters of Grovnia

Danny Green
as Socks, American Henchman

Wallace Evennett
as Smith, Bowler-hat Henchman

Monti DeLyle
as Pierre, Knife-throwing Henchman

Dino Galvani
as Tony, Slender Henchman

Arthur Finn
as Mac, Newspaper Editor

Laurence Hanray
as Sir George, Lead Conspirator

Arthur Gomez
as Baron von Kleisch, Delegate