David Callan, secret agent, is called back to the service after his retirement, to handle the assassination of a german businessman, but Callan refuses to co-operate until he finds out why this man is marked for death.
Callan is a 1974 British thriller film directed by Don Sharp and starring Edward Woodward, Eric Porter, Carl Möhner and Russell Hunter. It was written by James Mitchell based on his novel A Red File for Callan, itself based on Mitchell's pilot episode for the ITV television series Callan (1967–1972).