Question: is there a fourth book of magnus chase

Answer: No, Magnus Chase and the Gods of Asgard is a trilogy of fantasy novels written by American author Rick Riordan and published by Disney-Hyperion. It is based on Norse mythology and is set in the same universe as the Camp Half-Blood Chronicles, and The Kane Chronicles series. The first book, The Sword of Summer, was released on October 6, 2015. The second book, The Hammer of Thor, was released on October 4, 2016. The Ship of the Dead, the third and final book, was released on October 3, 2017.