Thorfinn and the Terrible Treasure by David MacPhail
Prepare yourself for the wrath of the Norsemen! That is, if you don't mind and it's not too inconvenient... Everyone knows Vikings are ruthless barbarians whose idea of a good time involves pillaging, plundering and feasting. But Thorfinn is no ordinary Viking! He is always polite and happily offers to wash the dirty dishes. Too bad his dad is Harald the Skull-Splitter, Village Chief and the roughest and toughest Viking of them all. Harald the Skull-Splitter and fellow chief Magnus the Bone-Breaker find a massive treasure chest in the remote Western Isles of Scotland. Thorfinn and his rival Olaf must guard it overnight, but despite their best efforts, they can't help falling asleep. In the morning the treasure has disappeared and now Thorfinn's village is at stake. Can Thorfinn the Nicest Viking and his friends find the missing loot in time to save their village? Thorfinn the Nicest Viking is a funny, illustrated, action-packed new series for young readers which bridges the gap between Horrid Henry and Diary of a Wimpy Kid, set in a world where manners mean nothing and politeness is pointless!