Colombian Luccio and his girlfriend Angie move into a respectable part of Berkshire. They later learn that Ron and Helen, the previous owners of their house died mysteriously. Angie discovers that their neighbours, estate agent Roy and his wife Jane, high court judge Charles and his bickering wife Carol, Bilbo a conceptual artist and his partner Diana, were all members of a wife-swapping circle who usually met at Ron and Helen's house. Luccio, who later reveals himself to be a police inspector, is curious as to how Ron and Helen died, so lines up all the suspects. (thetvdb.com)