The way to get a divorce in 1959 England is to prove adultery, and for that, you need a private detective who doesn't have too many scruples. Tony Aaron (Liam Neeson) is a police officer who has lost his job and hit the skids. He scrapes by faking adultery evidence; his wife gets the victim into bed for Tony to photograph. But something goes wrong, and his wife and the painter Carlo Stasio (Michael Almaz) have been brutally murdered. The prime suspect is Carlo's mistress (Laura San Giacoma), but the case doesn't make sense to Tony. The deeper he goes, the worse it gets, and soon he is in the middle of a dark conspiracy.