Dishonored is a game about systems, choices and unique pathways. The first time you see it in action your mind hurtles through a constant stream of comparisons. Deus Ex comes first, then Hitman, Thief, Vampire: The Masquerade - Bloodlines, BioShock and even - at a point at which the hero occupies the body and soul of an ornamental fish - Disney's Sword in the Stone.