Enter a London like no other in this fast-paced, captivating fantasy novel, perfect for fans of V.E. Schwab and Genevieve Cogman.

Oyster McLellen has spent his life causing mischief. Running with a small-time gang and fleecing money from tourists in Hyde Park to support his struggling family in the absence of his father, who abandoned them years ago.

When a simple money drop for his boss, Big Mickey, goes wrong, Oyster's future looks bleak. His only chance to redeem himself in the eyes of Mickey is to get the money back, but as he pursues the thieves across South London he suddenly finds himself washed up on a beach, surrounded by broken phones and shattered office furniture.

His new world: Greater London. A city built on the detritus of our own, where leviathans crafted from broken skyscrapers roam the seas, where ink beetles nestle beneath the skin of its residents and where Oyster's father, Lucas, may well have escaped to all those years ago.

But there are bigger things at stake. Oyster's allegiances are torn between the enigmatic Nonesuch, the eccentric escapist Marya Petrovna, and the terrifying Mr Primrose - and he will have to choose who to align himself with quickly. Because plans are afoot: something ancient is brewing, and a choice needs to be made, the consequences of which will determine the fate of Londons, and life, everywhere.