A small time diamond merchant jumps at the chance to supervise the purchase and cutting of a large first class diamond. But when the diamond is stolen from him, he is blackmailed into pulling off a major heist at the Diamond Exchange, located at 11 Harrowhouse.
Howard R. Chesser
Charles Grodin
Maren Shirell
Candice Bergen
Charles D. Watts
James Mason
Clyde Massey
Trevor Howard
Meecham
John Gielgud
Lady Anne Bolding
Helen Cherry
Coglin
Peter Vaughan
Wildenstein
Cyril Shaps
Max Toland
Leon Greene
Miller
Jack Watson
Fitzmaurice
Jack Watling
Sir Harold
Clive Morton
Whitman
Larry Cross
First Guard
Glynn Edwards
Second Guard
John Bindon
Hickey
Joe Powell
Doctor
Michael Gover
Patient
Michael Hawkins
Stewardess
Patricia Michael