Showing Hex and the City by Simon R. Green

John Taylor is a private detective with a supernatural gift for finding things - people, property - but his latest case is different. This time it's personal.

Lady Luck has hired Taylor to investigate the origins of the Nightside - the shadowy heart of London where time remains fixed at 3 a.m. But the further he delves into the history of the Nightside, the more Taylor learns about the great mystery in his own life: exactly who - or what - his mother is.

Taylor has been warned: when it comes to his mother, the truth can be dangerous. In fact, it can be downright catastrophic - not just for the Nightside, but for all of existence.

But John Taylor is an investigator; finding things is in his nature. And now he's so close to discovering the truth he has always craved, it seems nothing will stop him. No matter what the consequences.