Callan has retired from the Department, runs his own military memorabilia shop called 'The Old Brigade' and is living with a woman called Margaret. Lonely has also moved on. He has a successful plumbing business and is engaged to be married.

But you are never retired when you work for The Department, and when Callan hears from the new Hunter that his services are required he discovers that a man named Hagggerty is writing a tell-all book which names Callan as a professional killer. Hunter tells Callan that it is a non-Departmental matter, and that it is between Callan and Haggarty. Callan enlists Lonely's aid, gets his magnum pistol out of storage at the bank and prepares to kill once again.