This will be the seventh move for Olga and her family. Luckily, she is very familiar with change and sees each move as an adventure. When they arrive at the new house, they are speechless: they have never seen anything like it, it is extraordinary! Once set up in her new room, Olga discovers a very small door locked with a key. What will be on the other side? Will someone live there? Does the mysterious door have something to do with Olga's parents not having returned from their walk in the woods? This books is a beautiful story of friendship, adventure and magic.