When Pettson can't get his Santa machine to work, Findus hits a postman on the toboggan run. He seems to know everything - except delivering letters. What he pulls out of his large bag may be just what Pettson needs.
Of course, the idea of a Santa machine is completely insane. Even Pettson thinks so, when he thinks about it. But now it's finally Christmas Eve and in a moment everything will start. What will Findus say?
Lucia day will be busy, at least for some, and the evening will not be quieter. Something happens up the road and suddenly the little cottage is full of visitors.
What does a nice gingerbread look like? Can you use anything for cake tins? There's a lot to disagree about when Pettson and Findus are going to make gingerbread together.
How can you feel calm, when there are people who constantly take away the things you need, just when you need them. And then refuses to return them. No, now Pettson is tired.
Now Pettson must have something to hide his secret invention in. Maybe Henrik and Linnea in the box store can help? But the worst of all is probably that he has to lie to Findus all the time.
Findu's wish list has disappeared. The cat is convinced that Santa has come to pick it up. Pettson, who is not as convinced, makes a plan about how he will try to build a Santa himself for Christmas Eve.
The Neighbor children Lasse and Josefina come to buy eggs from Pettson. They both talk about Santa all the time and Findus becomes spellbound. Now Pettson is really getting worried. How should he behave, so as not to disappoint the cat?
Old man Pettson promises his cat Findus that Santa will come to them on Christmas Eve. Afterwards, of course, he regrets it. You have to keep what you promise.