Kid vs Squid by Greg Van Eekhout (author) (US edition)

A story of sea monsters, curses, witchy magic and the lost island of Atlantis. With fairground games on the pier tossed in. Insanely addictive. Thatcher Hill is bored stiff of his summer job dusting fake mermaids and shrunken heads at his uncle’s seaside Museum of Curiosities. But when a mysterious girl steals an artifact, Thatcher’s summer becomes a grand adventure. The thief is no normal girl; she is a princess of the lost island of Atlantis. Her people have been cursed by an evil witch to drift at sea all winter. They wash ashore each summer to an even more terrible fate: working the arcade games and food stands on the boardwalk. Can Thatcher save them – or will he also succumb to the witch’s curse?