Basil Sydney as Inspector Philip Winton

Judy Gunn as Claire Haines

Zoe Davis as Mrs. Harris

Alastair Sim as Police Sergeant 'Mac' McKay

Reginald Tate as Hubert Perrin

Ian Fleming as Henry Sanders

Tom Helmore as Alfred Jerome

Martin Lewis as William Gregg

C.M. Hallard as Dickenson - Norman's Attorney

Aubrey Mallalieu as Robert Norman

Ernest Borrow as Superintendent Field

Sydney Moncton as Globe Reporter

Albert Parker as Movie Director (cameo appearance)(uncredited)