Penguin Books Magnus Chase and the Sword of Summer (Book 1)

The first book in this incredible new series from the creator of the "Percy Jackson" series, featuring the gods of Norse mythology. Magnus Chase discovers that he is the son of a Norse god. He finds out that the Viking myths are true, the gods of Asgard are preparing for war and trolls, giants and worse monsters are stirring for doomsday.To prevent Ragnarok, Magnus has to search the Nine Worlds for a weapon that has been lost for thousands of years.