David MacPhail 
Thorfinn and the Awful Invasion [EPUB ebook] 

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 isn’t an 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. Tired of Thorfinn and his too-nice ways getting them into trouble, his dad decides it’s time for Thorfinn to earn his gruesome Viking name. Stuck on a longboat with a ragtag bunch of adventurers who’d like to throw him overboard, how will the Nicest Viking cope with a dangerous voyage to Scotland? Thorfinn the Nicest Viking is a funny, illustrated, action-packed new series for young readers who love Horrid Henry and Diary of a Wimpy Kid, set in a world where manners mean nothing and politeness is pointless!