Mimi sees the world with her hands and ears. She is blind. Together with their best friend Lisa, they have already visited many fantastic worlds full of fun, but also mysteries. Now Christmas is finally here. Mimi and Líza together with the neighbors from the house decorate a beautiful, magnificent tree. Except the light bulbs on it don't want to shine. Where did the magical Christmas light go? Escaped? Or did someone steal it? Maybe the suspicious neighbor Viliam, who is not friends with anyone, has his fingers in it. The answer lies in the past, when the neighbors were still young children. So Mimi and Lisa embark on an adventurous journey through time to bring back to Christmas its enchanting light.