First broadcast 17th November 1975.
An armed gang kidnap telephone engineer Ronald Peters and hold him in an empty house, using his expertise to trigger off false alarms in some banks, diverting the police whilst the gang rob alarm-free premises.
John Thaw - Regan
Dennis Waterman - Carter
Garfield Morgan - Haskins
Robert Swann - Det. Sgt. David Keel (as Robert Swan)
Myra Frances - Dr. Liz Keel
Christine Shaw - Kathy Peters
Andonia Katsaros - Annie Clark
Leslie Schofield - Ian Ross
David Belcher - Police Inspector
Shaun Curry - Ronald Peters
Malcolm Kaye - Brian Slater
Alan Brown - The Consultant
Roy Sampson - Uniformed Constable
Bobby Collins - Young Boy
Tony Allen - Bill the Driver
John Cannon - Armed Officer
Ron Gregory - Radio Officer/Armed Officer
Bill Hibbert - Flying Squad Member
James Muir - Armed Officer
Byron Sotiris - Constable
Bill Wallis - 'Mummy' (voice)
Bill Westley Sr. - Constable
