Where the Sun Always Shines follows Tom (Per Lasson) and Petra (Lisa Linnertorp), a successful couple who have built up a large Ica Maxi store in Linköping and sold it for a record sum. They have been living a life of luxury in Mallorca with their sons for a month, ready to enjoy an eternal vacation. But their lives take an unexpected turn during Tom's 50th birthday party, leading his brother Timmy (Erik “Jerka” Johansson) and his wife Maja (Rakel Wärmländer) to move their family to the sunny climes of Mallorca, where chaos ensues.