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Unknown to everyone but his shady Middle Eastern bosses, watchmaker Hawkins (Alastair Sim) is actually a professional hired assassin with a predilection for killing his targets with bombs. After disposing of a dictator and millionaire, Hawkins is assigned to kill a politician who is heading to a remote hotel, The Green Man, for a secret tryst with his secretary. There, however, Hawkins' plot is discovered by vacuum salesman William Blake (George Cole), who determines to stop him. Wikipedia