Phyllis Calvert as Evelyn Acheson

Eric Portman as Henry Acheson

Stanley Baker as Stephen Lorimer

Mandy Miller as Elizabeth Lorimer

Dora Bryan as Cassie

Percy Herbert as Det. Sgt. Taylor

Joan Benham as Vera McNally

Victor Maddern as Bert

Martin Miller as Professor Topolski

Joan Hickson as Cook

Alfie Bass as Ticket Collector

Bruce Beeby as Policeman

Grace Arnold as Mrs. Groves

Molly Urquhart as Mrs. Parsons

Estelle E. Richmond as Nurse

Peter Burton as Howard Forbes (uncredited)

Maggie Smith as Party Guest (uncredited)

Christopher Toyne as Peter McNally (uncredited)

Carol White as Elizabeth's Friend (uncredited)