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.

Marie and David are always arguing while their friends Sara and Samuel always seem to be happy together. Or are they? This year they decide to spend Christmas in the mountains together.