Pelle and Maja have disappeared and Maja's mother is beside herself with worry. And right at that point so are Måns coming to the rescue with his newly started detective agency.
Christmas is approaching and Trisse and Pelle arrange a rhyme house at the pub. Then the terrible thing happens, the Christmas gift basket disappears without a trace.
Pelle has saved Åsgränd from a fire and received a medal. And he proudly wants to show it off to Maja. But Måns and his cronies Bill and Bull don't want that.
It's Måns birthday and he gets up from his bed to speed on Bill and Bull. As he really want to be celebrated. So Måns makes a thunderous birthday party.