Murder take three

"1956. American movie star Suzie Reynard is currently shooting a murder mystery film at Marling Hall, an Elizabethan manor house in the depths of the Norfolk countryside. The film's director--Suzie's lover--has been receiving threats and Suzie is convinced his life is in danger. On arriving at Marling Hall with his fiancée Marie, Private Investigator Donald Langham finds the film set awash with clashing egos, petty jealousies, ill-advised love affairs and seething resentments. And then a body is discovered in the director's trailer. It would appear to be an open-and-shut case when someone confesses to the murder. Donald and Maria are not convinced--but why would someone confess to a crime they haven't committed?"--book jacket