Deep in the research wing of the Natural History Museum is a prizespecimen, something that comes along much less often than once in alifetime: a perfect, and perfectly preserved, giant squid. But what does itmean when the creature suddenly and impossibly disappears? For curatorBilly Harrow it's the start of a headlong pitch into a London of warringcults, surreal magic, apostates and assassins. It might just be that thecreature he's been preserving is more than a biological rarity: there arethose who are sure it's a god - A god that someone is hoping will end theworld.