Norse god Loki records the highs and lows of living on Earth as an eleven-year-old in grumbles, snarks, and doodles in his enchanted diary. He might not have shown any moral improvement (yet); but Odin has given Loki another chance to prove himself worthy of Asgard. Earning everyone's trust isn't easy, however. So far, Loki has managed to make only one human friend, Valerie, but is now irritated to learn that Valerie has made another friend, Georgina. Then, at Thor's birthday party (a pointless mortal ritual, though luckily there is cake), the magical hammer Mjolnir is stolen-and everyone suspects Loki! Can Loki find Thor's hammer, discover who the real thief is, and clear his name-or will his jealousy over Valerie's new friend cloud his judgment?