Synopsis

Just when the summer vacation is about to start, the parents need to go to a work trip and leave the kids, Lukas and Thor with their grandma. This upsets the children at first but when grandma Aada starts to take the kids around their hometown, Tartu, while telling them exciting stories about it’s history, the previously boring place opens up and the boys start to see it in a completely different light. One morning the brothers want to surprise their granny with some freshly baked pastry. On their way to the bakery they decide to take another look at the tunnel they saw the day earlier. While investigating the entrance to the tunnel, they suddenly find themselves in the historic Tartu, when it was still called Dorpat. Lukas and Thor are going to have to fight the malevolent dragon and save Dorpat to find their way back home.