Thorfinn and the Gruesome Games

Thorfinn and the Dreadful Dragon

Thorfinn and the Disgusting Feast

Thorfinn and the Terrible Treasure

Thorfinn and the Putrid Potion

Thorfinn and the Awful Invasion

Thorfinn and the Rotten Scots

Velda the Awesomest Viking Collection

Thorfinn and the Dreadful Dragon and Other Adventures

Top Secret Grandad and Me: Death by Tumble Dryer & Death by Soup

Thorfinn and the Awful Invasion and Other Adventures