Five Einsteiners and three peppercorns from Hamburg experience unforgettable holidays together. Io (Clara Jaschob) and Joyce (Matilda Willigalla) from "Schloss Einstein" secretly stay at their boarding school in Erfurt during the holidays. But suddenly there is a break-in at night. They then decide to go hunting for criminals themselves.
Sofia and Emil have agreed to give each other presents for Christmas. When the present for Sofia turns out to be expensive, Emil asks his friend Liam for help earning some money.
The boy Javi has moved with his family to a house with a garden, and that same night he sees light in the tree that overlooks his window; he investigates, climbing a branch, and thus meets a group of funny and curious animals that come together to chat every night about natural sciences.