Sixteen years ago, Harry and Monica were living a glitzy life playing big arenas with their band, Harmonica. Now their marriage is in crisis, and when a nostalgia tour is offered, Monica gives Harry an ultimatum. Tour, or divorce.

Harry (Jonas Karlsson) and Monica (Josephine Bornebusch) were top of the pops as country music duo Harmonica in the 1990s, but their life has been out of key ever since. In a last-ditch effort to salvage their career and relationship, the couple head on a reunion tour of Europe that brings their problems to a crescendo. While things seem grim, the tour simultaneously gives them a chance to rediscover their passion and face their accumulated traumas.