Swedish drama based loosely on a true story. Marten Klingberg plays Peter, an engaged man who finds himself attracted to a gay man called Nassim (Pjotr Giro). Peter's life is suddenly transformed from one of married domestic routine to one of passionate lust and longing for his new gay lover. However, things take a tragic turn when Nassim is discovered dead and Peter is accused of his murder.

"Home Guard and Mumps" is set in the mid-1940s, the farmer Nils Erik Kristersson (Stefan Gerhardsson) farm at Ätran in Falkenberg. He is married to the ill-tempered Mathilda (Siw Carlsson), and together they have daughter Greta. The farm is also home to the försupne toffelmakaren Ola Larsson (Krister Claesson) and the bleating maid Emma (Tina Leijonberg). The farce begins with the second lieutenant Löwendahl (Tommy Juth) and Sergeant Malmberg (Gosta Janson) shows up in the yard to announce that they intend to use the farm for the Home Guard.

With some hesitation, Lukas brings his new girlfriend Amanda home to his father Nils for dinner.