"I know of four Londons," says Kell, strangely pleased to have baffled Sirius. He is out of his element here, but at least he can still surprise the other man. "Perhaps five, if we are to count yours."

Kell pulls a stack of napkins to him, lifting their thin layers one by one. "They sit atop one another in reality - magicless Grey, then my London, red and full of magic, then White London, starved of magic and at war, then Black, sealed away forever. As Antari I travel between them all, but Red is my home. London is its name, but Arnes does not look like England. For some reason, only the names and locations are the same."