A group of children aged ten to twelve meet in a camp located in an abbey. Their counselor must leave urgently due to family problems and Leo, a child, arranges it so there will be no substitute, and so they find themselves alone. The children meet every day in a cave behind the abbey and exchange their famous: "I swear to keep the secret of the abbey, not to tell anyone that Bruno is gone, we are here to have fun, laugh and together we will have the best vacation of our lives!"
