Sexton Blake

Dick Warren

Stella Duncan

James Duncan (as Julian Mitchell)

P.C. Morgan

Paul Dacier

Phillip Rainsford

Purvis

Marat

Beales

Cotter

Carl

Dr. Grey

Fox

Col. Wills

Preston

Sergeant Crossby

Wrexham

Otto

Sir Horace Cranston

Van Schuster

Housekeeper