Kiki, Marietta, Mr. Leclair and Celestin do not know each other, but they meet by chance, and for different reasons, in a strange hotel abandoned in the middle of the forest. The hotel is invisible, except for them! Due to their presence, Mr. Snarf, the ghostly butler, wakes up and tells them that Hotel Strange used to welcome all the forest creatures when spring came. After a « magic » cake recipe which made the hotel famous was stolen, the hotel was closed, faded and almost vanished. Marietta and her friends are willing to re-open Hotel Strange, that’s why they start looking for the lost recipe. Through this adventure, they will discover a precious ingredient that will change their lives.