Gosford Park is a murder mystery film directed by Robert Altman and written by Julian Fellowes. The film follows the lives of the guests and servants at Gosford Park, a lavish country estate owned by Sir William McCordle and his wife Lady Sylvia.
The guests include Sir William's relatives, such as his sister Lady Constance, her husband Lord Raymond Stockbridge, and their daughter Isobel. There are also various friends and acquaintances, including Hollywood film producer Morris Weissman and actor Ivor Novello.
The servants at Gosford Park are led by the efficient head housekeeper Mrs. Wilson, the mysterious valet Robert Parks, and the ambitious ladies' maid Mary Maceachran.
The tension between the wealthy guests and their servants becomes evident as the weekend progresses, with secrets and rivalries coming to light. When Sir William is murdered during a hunting party, the house is thrown into chaos as the guests and servants are interviewed by Inspector Thompson and Detective Sergeant Keaton.
As the investigation unfolds, it becomes clear that many of the guests and servants had motives for wanting Sir William dead. The film delves into the class divide between the upstairs and downstairs residents, as well as the complex relationships and secrets that bind them together.
In the end, the murderer is revealed to be none other than Mary Maceachran, who had been seeking revenge for a past injustice. The film ends with the guests departing Gosford Park, leaving behind a trail of scandal and intrigue.