Stanley Baker
— Detective Sergeant Jack Truman
Anne Heywood
— Cathie Murphy
David McCallum
— Johnnie Murphy
Peter Cushing
— Father Laidlaw
John Slater
— Sgt. Walker
Clifford Evans
— Headmaster Evans
Moultrie Kelsall
— Superintendent
George A. Cooper
— Chief Inspector
Brona Boland
— Mary Murphy
Fergal Boland
— Patrick Murphy
Michael Chow
— Alexander
Tsai Chin
— Primrose
Sean Lynch
— Slick
Bernice Swanson
— Meg
Freddie Starr
— Tommy
Sheila Raynor
— Mrs. Catlin
Christopher Cooke
— David Catlin
Irene Arnold
— Mrs. Baker
Oonagh Quinn
— Jilly Baker
Ali Allen
— Boy (uncredited)
Grace Arnold
— Customer in Grocer's Shop (uncredited)
John Boxer
— Police Sergeant (uncredited)
Jeremy Bulloch
— Pageboy at Hotel (uncredited)
John Bush
— (uncredited)
Michael Collins
— Police Officer in Patrol Car (uncredited)
Keith Crane
— William (uncredited)
Gerrard Gibson
— (uncredited)
Victoria Harrington
— Child (uncredited)
Melvyn Hayes
— Kid in Johnnie's Gang (uncredited)
Lindsay Hooper
— Police Sergeant (uncredited)