Screenplay by DONALD JAMES   Directed by JOHN GILLING     Craig poses as a prisoner and embarks on an escape plan with a fellow-prisoner. But it leads to torture, not freedom......     A safe is broken into in a foreign embassy in London. A security tape records the sounds of photographs being taken. But the intruder, Paul Westerman (PATRICK ALLEN), escapes.   The Ambassador, Garcian (MARTIN BENSON), ’phones the police, and Westerman’s escape car is intercepted. The camera is found, but there is no trace of the film and, because of the political implications—the country concerned is negotiating a new defence treaty with Britain—Nemesis is called in.   If Westerman has been photographing top secret instructions to the Ambassador, only the British Government would be interested. So is Westerman working for British Intelligence? And if he is, this could lead to the break-off in the defence negotiations, which would be welcome news to any country hoping to move into the arms market. Nemesis’s job is to prevent an arms race.   Westerman finds himself in prison and Craig Stirling (STUART DAMON), masquerading as a fellow-prisoner, becomes his cell-mate, gradually putting over the suggestion that he can help them both escape. But Craig is not the only one planning an escape for Westerman. Garcian is doing so as well, using as his intermediary a fix-it crook named Booker (JOHN NETTLETON) whose girl-friend Sarah (GABRIELLE DRAKE) is helping him.   Craig’s plan goes ahead, with Richard Barrett (WILLIAM GAUNT) helping in the guise of a prisoner padre; but the plan goes awry. Both Craig and Westerman find themselves in Booker’s hands and Booker, in turn, tries to double-cross Garcian—but he believes Craig to Westerman and vice versa. Believing that there is more money to be gained if he can find out what lies behind it all, Booker tortures Craig in efforts to make him talk. Failure to do so, eventually leads him to handing him over to Garcian, and thus discovering that he has been torturing the wrong man.   Craig in turn, is in for a surprise when he discovers that Garcian and Westerman are anything but strangers—and on his next move depends the success or failure of the coming conference...     AN PRODUCTION   Series created by Monty Berman and Dennis Spooner   © Copyright Incorporated Television Co. Ltd. MCMLXVII     Stuart Damon   Alexandra Bastedo   William Gaunt   Anthony Nicholls     Craig Stirling   Sharron Macready   Richard Barrett   Tremayne     Patrick Allen   Martin Benson   John Nettleton   Gabrielle Drake   Jack Gwillim   James Donnelly   Lawrence James   Victor Brooks     Westerman   Garcian   Booker   Sarah   Carrington   Pickering   Sergeant Fairfax   Collins     Associate Producer   Director of photography   Art director   Editor     Johnny Goodman   Frank Watts   Charles Bishop   Derek Hyde-Chambers     Musical director   Theme composed by   Post-production supervisor   Production manager   Casting   Stunt arranger     Edwin Astley   Tony Hatch   Philip Aizlewood   Malcolm Chistopher   Judith Jourd   Bill Sawyer     Sound editor   Sound recordists     Music editor   Associate art director   Set dresser   Construction manager     Ray Lafbery   Len Abbott Claude Hitchcock   Alan Willis   John Graysmark   Brian Rider   Bill Greene     Second unit director   Second unit cameraman   Camera operator   Assistant director   Continuity   Special effects     Ray Austin   Jimmy Harvey   Harry Gillam   Denny Lewis   Sally Ball   Sid Pearson     Scenic artist   Production buyer   Make-up supervisor   Hairdressing   Wardrobe supervisor   Supervising electrician     A.J. Van Montagu   Sid Palmer   Gerry Fletcher   Michael Jones   Laura Nightingale   Ted Hallows       Made on location and at ASSOCIATED BRITISH ELSTREE STUDIOS ENGLAND.