In the old villa, there is a strange smell - a mix of a thousand things at once. It's the first thing Luzie notices about her new home. But the scents lead nowhere, and the key Luzie finds under a floorboard doesn't fit any lock. Is there a hidden room in the villa? Together with her little brother Benno and the neighbor boy Mats, Luzie sets out to search. As they venture into the concealed part of the villa, the children can hardly believe their eyes: countless fragrance bottles line the ceiling-high shelves, shimmering and bubbling! But the bottles hold not only beautiful surprises but also plenty of dangers. Especially one bottle would have been better left forever sealed...