The series is named after a small part of Saltsjöbaden called Solsidan. It revolves around Alex and Anna who are expecting their first child and have just moved to Alex's childhood home in Saltsjöbaden, Stockholm County. Alex tries to get Anna to enjoy herself, and at the same time spend time with his childhood friend Fredde.

Leo brings his girlfriend to his dysfunctional and gambling family.

Christmas 1945. In a train from Stockholm to Berlin are a motley collection. It is the failure of the author Gunnar who wants to leave his old life and make a contribution in Berlin; physician Henry who plan to marry Marie and likewise Henry's current wife Karin, who he plans to kill during the journey, the middle-aged gay couple Pompe and Sixten, a soldier going to Uppsala but is on the wrong train: the cheerful and cynical old Margaret, and a dressed elf and a surly conductor. With the train are also a number of Baltic refugees accompanied by two nuns to be sent to Germany.