After an innocent man is executed in a case he was responsible for, a Scotland Yard superintendent finds himself investigating the murder of his key witness.

Sydney Greenstreetas Supt. George Edward Grodman
Peter Lorreas Victor Emmric
Joan Lorringas Lottie Rawson
George Coulourisas Supt. John R. Buckley
Rosalind Ivanas Mrs. Vicky Benson
Paul Cavanaghas Clive Russell
Arthur Shieldsas Rev. Holbrook
Morton Lowryas Arthur Kendall
Holmes Herbertas Sir William Dawson
Ernest Haller
Robert Burks