It's their last Christmas vacation together as a family, and the Schroeders are spending it on a resort island in Thailand. There, the 18-year-old son Felix falls in love with Fai, a beautiful Thai woman. His brother and mother suspect that the slightly enigmatic Fai is a prostitute, but Felix is simply swept away by her. At the end of the vacation, already at the airport, he announces that he has decided to simply stay longer and follow Fai to the North of the country, where her parents live. Felix' parents are appalled. Mother Annegret too decides to cancel her flight home and goes looking for her son in the backwaters of Thailand, which leads to several complications. Meanwhile, Felix discovers the true mystery behind the beautiful Fai.