Fan Casting Murder at the Mansion

A group of 28 people are invited to the estate of Sir Frederick Howell the III. The group soon learns of Howell's death and 9 various members of their group are picked off one-by-one. They must uncover the identity of the culprit before it's too late. The remaining 11 members of their group survive the next day, as the true culprit was put under arrest for 9 counts of murder. She is later sentenced to life in a maximum security prison.