Camden, North London. A tangled, mangled junction of train lines, roads and waterways. Where minor celebrities hang out with minor criminals and where tourists and moody teenagers mingle.

In the heart of Camden, where rail meets road meets leyline, you might find the Arcana Emporium, run by one Alex Verus. He won't sell you a wand or mix you a potion, but if you know what you're looking for, he might just be able to help. That's if he's not too busy avoiding his would-be apprentice, foiling the Dark, outwitting the Light, and investigating a mysterious relic that has just turned up at the British Museum.