JÔerÔemie is overjoyed to spend the day with his girlfriend Sandrine. She lives now in a great manor built hundreds of years ago! Sandrine offers JÔerÔemie to play chess, but the boy intends to make her forget this activity. Knight's word, he will find a game more exciting! And even if it's raining. Except that Jeremiah does not know that chess will launch him on the trail of a fascinating enigma to solve in the company of his beloved princess.