Col. Armand Lucien
Abbott
Bill Stevens
Major Henri de Beaujolais
Jim Ralston
Sir Thomas Egerton
Challon
Howard Joyce
Joe Garvey
Dr. Anton Rader
Senor De La Torre
Dr. Lawrence 'Larry' Stevens
Hiram Rogers
Jim Cameron
Gerald Trask
McDowell
Philo Vance
Dr. George Vanders
Phillip Corey
Dr. Paul Venner
Colonel Tillman
Thomas Bradford
Fingers
Prof. Landis
Major Thompson
Inspector Thornton
Sam Brooks
British Military Intelligence Agent
Sir William Clintock
Stephen Gore
Dr. Mansfield
Carew
Lewis
Inspector Clarke
Ben
Squadron Leader Charles Wyatt