Suzy Kendall as Julie West

Frank Finlay as Det. Chief Supt. Velyan

Freddie Jones as Reporter

James Laurenson as Greg Lomax

Lesley-Anne Down as Tessa Hurst

Tony Beckley as Leslie Sanford

Anthony Ainley as Mr. Bartell

Dilys Hamlett as Mrs. Sanford

James Cosmo as Det. Sgt. Beale

Marianne Stone as Matron

Allan Cuthbertson as Coroner

Kit Taylor as Doctor

Janet Lynn as Girl in Library

Patrick Jordan as Sgt. Milton

Anabel Littledale as Susan Miller

Tom Chatto as Police Doctor

Jan Butlin as Day Receptionist

William Hoyland as Chemist in Hospital

John Swindells as Desk Sergeant

Jill Carey as Night Receptionist

David Essex as Man in Chemist Shop

Valerie Shute as Girl in Chemist Shop

John Stone as Fire Chief

Siobhan Quinlan as Jenny Greenaway

Patricia Driscoll as Mrs. Hurst (uncredited)

Pat Gorman as Final scene pc (uncredited)

Charles Rayford as Dead Chemist (uncredited)

Renu Setna as Doctor (uncredited)

Reg Thomason as Man in Police Station (uncredited)

Joe Wadham as Police Driver (uncredited)