Magic Tree House: Summer of the Sea Serpent

Jack and Annie are in a seaside land of mystery and myth, questing to solve an ancient riddle. Merlin the magician has set a puzzle for them – and luckily, they have a young sorcerer to help. From underwater caves to a Spider Queen’s den, and from mystical selkies to a magical sword, their mission is full of magical elements. But when a terrifying sea monster appears, it’s clear that this summer vacation is no day at the beach!