Callan is a 1974 British thriller film directed by Don Sharp and starring Edward Woodward, Eric Porter and Carl Möhner. It was based on the ITV television series Callan which ran from 1967 to 1972. The script by James Mitchell is based on his original TV pilot "A Magnum for Schneider" and the novelization thereof, Red File for Callan, although only the novel is listed in the film's credits (as A Red File for Callan).
^ http://ftvdb.bfi.org.uk/sift/title/28518Synopsis
David Callan (Edward Woodward), a leading intelligence agent/assassin in the employment of S.I.S., was forced into retirement due to him losing his nerve. Now, Callan is called back into service to handle the assassination of Schneider, a German businessman. Colonel Hunter (Eric Porter), his former employer promises Callan that he'll be resumed to active status as long as he follows his orders. But as ever, Callan refuses to act until he knows exactly why Schneider has been marked for death...
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