"The Hammer of Thor" is a significant installment in Rick Riordan's Norse mythology series, part of the Magnus Chase and the Gods of Asgard trilogy. The book follows Magnus Chase, a demigod and teenager, as he embarks on a quest to retrieve Thor's missing hammer, Mjölnir. Its absence poses a serious threat, potentially leading to catastrophic consequences. To achieve this goal, Magnus teams up with his friends and members of the Norse pantheon.
Throughout their journey, the characters encounter various challenges and mythical beings, showcasing Riordan's signature blend of humor, action, and rich storytelling. The narrative explores themes of friendship, bravery, and the importance of working together to face overwhelming odds. Riordan's adept characterization makes the story engaging, as readers become invested in the protagonists' struggles and victories.