Anansi Boys (Anansi Boys #1)

"Fat" Charlie Nancy leads a boring life as a boring Londoner, until he discovers two things: That his recently deceased father was, in fact, Anansi the Spider, the trickster god of African folklore, and that he has a twin brother he's never met. Which kicks off a reality-spanning odyssey of sibling rivalry, jealous deities, and one poor soul who'll realize what it means to be a god.