When an art heist goes wrong, Jay Moriarty calls for help — and in the middle of the night, Sebastian Moran heads out into the streets of London to find him. But he's not the only one hunting Moriarty, and it's not long before Moran's search leads him into a clash with a rogue mercenary company. To save his partner, Moran will have to take any help he can get ... even from an untrustworthy cat burglar named John Clay.