Loki. A bad God's guide to taking the blame - Louie Stowell

Loki might not have shown any moral improvement (yet) but Odin has given him another chance to prove himself worthy of Asgard by keeping Earth safe from the threat of Frost Giants. But eleven-year-old Loki has more important things to worry about:

Parents Evening.

After a series of 1-star reviews from his teachers, Loki is jealous of the glowing adoration bestowed upon Thor and swears vengeance. So when Thor has a birthday party and his favourite hammer, Mjolnir, goes missing, everyone suspects Loki.

To clear his name, Loki must find Thor's hammer and find out who the real thief is