Twenty Thousand Leagues Under the Sea meets Frankenstein in this inventive YA fantasy from award-winning author Frances Hardinge   The gods are dead. Fifty years ago, they turned on one another and tore each other apart. Nobody knows why.   Now, even coin-sized scraps of dead god are worth a fortune because of the strange powers they're said to possess. But few are brave enough to dive and search for them.   When fifteen-year-old Hark finds the still-beating heart of one of t