11-year-old Tim is way ahead of the other boys his age: nothing excites him more than explorers, myths, dinosaurs and legends - and planning his mother's life! One day, however, Tim's life is about to change completely: He accidentally discovers a photo of an explorer living in Scotland on the internet and he looks like the spitting image of his dead father! The adventurous boy secretly sets off on a journey to Iverness, the famous Scottish village on the banks of the legendary Loch Ness. And what awaits him there exceeds Tintin's wildest expectations.

Eleven year old Tim plays fate and takes a flight to Scotland with his father Eric. They were happy there two years ago, shortly before his mother Anna died in a car accident. In Scotland, Tim combs through the Hartspring Castle and whose crypt. He finds a chart with Celtic characters, that refers to the true existence of the legendary Loch Ness monster.