Book 25: The Hammer of Thor

Rick Riordan's second installment of the Magnus Chase series, The Hammer of Thor, chronicles the adventures of Magnus and his friends as they try to locate and return Thor's hammer before the giants attack Asgard.  As usual Loki the trickster is behind everything with a plan designed for his own benefit.  He has arranged a marriage between Sam the Valkarie and a giant named Thrym, who is in possession of the hammer.  A new einherji named Alex, another child of Loki and an argr, joins Magnus, Sam, Blitzen, and Hearth in their quest.  What follows is the usual romp from one life-threatening situation to another with a large dose of humor binding it together.  Four stars.