In this amazing fantasy, there are four dimensions that each have a London. Only Antari, blood mages, can travel to these Londons. Kell is one of the only Antari left who is charged with exchanging mail between the rulers of the Londons, but he has a nasty habit of smuggling more than mail between worlds. He trades objects from other worlds for the right price, and that’s been going well until one object brings trouble with it. Now he is on the run. He meets Delilah Bard, a thief from Grey London….