First broadcast 23rd May 1973.

When a psychotic ex-CID officer barricades himself and a hostage in an office building, lacing it with multiple bombs, Craven and the Special Branch team are called in.

George Sewell ... Detective Chief Inspector Alan Craven
Roger Rowland ... Detective Sergeant Bill North
Geoffrey Bayldon ... Sumner
Ursula Howells ... Mrs. Sumner
Brian Haines ... Webb
Tamara Hinchco ... Mrs. Kesky (as Tamara Hincho)
Jumoke Debayo ... Sheila Fenner
Donald Webster ... Kesky
James Bree ... Ray Beckett
Harold Kasket ... Psychiatrist
John Gregg ... Sergeant Ramsay
Paul Greenwood
Jenny McCracken
Deborah Brayshaw
Aubrey Richards ... Dalby of the Gazette