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The mice Berta, Ludvik and Goya work at the post office at night and in their free time they make dreams and wishes come true for the people of their town. Finally, they decide to take a break and make their own dream come true - to go to the North to visit Santa Claus! However, the reality is quite different. The house of the Christmas Grandfather is more like a factory or a laboratory, where robots and computers take care of everything. He's happy - he has plenty of time for sleep, yoga, dancing and other activities, but the postal mice can't accept this. Computers rely on algorithms rather than feelings. Who will understand children's dreams and send the most desired gift?

The trio's holiday suddenly turns into a global mission! If the mice were able to help people in their town, maybe they can help Santa Claus too?