The Great Circus Mystery

Joe Bonomo

Welles 'Red' Landow

Louise Lorraine

Trixie Tremaine

Robert Graves

Adams (as Robert J. Graves)

Robert Seiter

Darrell

Carmen Phillips

Natchi

Slim Cole

Mystery Man

Charles Murphy

(as Carlo De Bernardi)

小弗兰克·科格伦

(as Junior Coghlan)