Lina is fourteen and visiting her grandmother Maminou. Lina loves sports, but Maminou thinks she should learn about the life of Leonardo da Vinci. Luckily, an encounter with a boy called Romain changes everything. Romain is Lina’s age, he’s fun to be around and he’s looking for… a secret tunnel – an adventure that will put the two teenagers in danger. Издание на французском языке.