A British agent's son is kidnapped and held for a ransom of diamonds. The agent finds out that he can't even count on the people he thought were on his side to help him, so he decides to track down the kidnappers himself.
Michael Caine
as Maj. John Tarrant
Donald Pleasence
as Cedric Harper
Delphine Seyrig
as Ceil Burrows
Clive Revill
as Alf Chestermann
John Vernon
as McKee
Joss Ackland
as Chief Supt. Wray
Janet Suzman
as Alex Tarrant
Catherine Schell
as Lady Melissa Julyan
Joseph O'Conor
as Sir Edward Julyan
Denis Quilley
as Bateson
Derek Newark
as Monitoring Policeman
Edward Hardwicke
as Mike McCarthy
