Gosford Park (2001) on Netflix

When William McCordle is found sitting at his desk with a knife in his chest, few people grieve. He and his wife Sylvia are hosting a weekend shooting party. There are a variety of guest including Sylvia sister and her husband, Lord and Lady Stockbridge; film star Ivor Novello and a Hollywood producer; an aunt who is dependent on McCordle for her allowance; and a variety of business associates all wanting something or other from the man. Downstairs at Gosford Park, there is a beehive of activity, but if truth be told, few among the servants will miss McCordle. Some of the women used to work for him in his factories and he was known to take advantages of his female employees. When the police announce that the victim died of poisoning and was only stabbed after he was dead, there is yet another mystery to solve. Beneath the surface, everyone in the house has secrets - but which would be a motive for murder?