Colonel March Investigates

Boris Karloff

Colonel March

Ewan Roberts

Inspector Ames

Joan Sims

Marjorie Dawson

Richard Wattis

Cabot

Sheila Burrell

Joan Forsythe

Anthony Forwood

Jim Hartley

Ronald Leigh-Hunt

Ireton Bowlder

Patricia Owens

Betty Hartley

John Hewer

John Parrish

Roger Maxwell

Maj. Rodman

Bernard Rebel

The Count

Dana Wynter

Francine Rapport

Marianne Stone

Customer in Bank (uncredited)

Peter Butterworth

Bank Clerk (uncredited)

Sonya Hana

Paula

Nita Valerie

Librarian

Cy Endfield

Man leaving British Museum library (uncredited)

Pat Hagan

Police Constable at Bank (uncredited)

Victor Harrington

Customer in Bank (uncredited)

Charles Saynor

Police Constable (uncredited)