Tiril, Oliver, Ocho and Grandpa Franz has been given a difficult mission. Tara, Grandpa’s friend and the owner of a big amusement park, has asked for their help to search for a special stone that her great-great-grandfather hid many years ago.

They must find the stone, shaped like a giant eye – better known as the Troll Eye, before the park opens after renovation in a few days. But they aren’t the only ones searching for the unusual stone, and quickly they realize that someone is following them, someone who always knows where they are. Will they be able to get rid of the follower? And can they find the Troll Eye in time before the park opens?

The Search for the Troll Eye is the twelfth activity book in the Detective Agency No. 2 series. Join the search by following traces, solving codes, and finding clues. Remember to keep your eyes open throughout the book to help the agency solve the mystery. The solution is hidden in the text and in the pictures – perhaps even on the next page!