Boston teenager Magnus Chase dies and wakes up in Valhalla, where he learns he is the son of a Norse god and must complete a quest to prevent Ragnarok—the end of the world—starting with finding the lost sword of the summer god Frey. The first Magnus Chase novel brings Riordan's witty, accessible mythology treatment to Norse mythology with a new cast of diverse heroes including a deaf elf and a Muslim Valkyrie. Fresh and funny.