Келл - one of those, who possesses surprizing ability to travel between Лондонами. In his world them a few.Grey, deprived magics reckless king George governs that. Complete of magic Red.White, where magic belongs to that, who will subordinate her to itself with a sword in hands. Once there was Black London.Every month of Келл delivers mail to the rulers of different Лондонов. And yet he helps illegally to travel between by the worlds those, who it not able, but ready to pay. Double life enthralling and full dangers. But once it will bring all around to the edge of death.