The cover somewhat suggests a “Being John Malkovich”-like film (after which many similar films have been made) which is in way true, but “Enemy” is in no way as interesting.
History teacher Adam watches a film in which an actor plays that looks exactly like him. He sets out to find this actor and finds him living nearby. Adam is an annoyingly nervous person, even more so when he meets his ‘doppelgänger’. The film does not make clear, and Adam probably does not know himself, why he wants to meet his double, but the events that follow certainly are not what he hoped for. The story is already not too appealing, but the ‘explaining’ last scene is pretty silly. Not that the film is awfull, it is not boring or anything, but it is just a not too convincing drama.