 While visiting the Dahl family Per Löfgren discovers that his old schoolmate Karin Dahl is confined to a wheel-chair after a car accident. Per frequently visits another old schoolmate, Willy Strid, and becomes a witness of the harsh quarrels between Willy and his wife Lena. Per s sister, Ingrid Löfgren, has a clandestine liaison with Karin s brother, Mattias Dahl.