Lotte and her friends Bruno and Albert decide to give their mothers a very nice surprise. But as it turns out, it will not come as the only surprise…

Lotte can do detective work again. The adventures begin this evening as Jaak flies across the village and checks that all the villagers go to bed at the right time.

Christmas has come to Gadgetville. This year, the villagers gather with Lotte's family to sing, dance, and give presents, as they do every year. This time, a surprising fir tree will also be attending the Christmas party.