A film producer (James Coburn) invites several guests to spend a week on his yacht in the South of France: a screenwriter (Richard Benjamin) and his wife (Joan Hackett), an agent (Dyan Cannon), a director (James Mason), a rising young actress (Raquel Welch) and her husband (Ian McShane). But what was supposed to be a week of fun and games turns into murder. Written by composer Stephen Sondheim and actor Anthony Perkins, this is a corker of a whodunit, a bouquet of catnip to lovers of murder mysteries. The glamorous Mediterranean location is easy on the eye, the cast first rate and the mystery by turns, clever, witty and diabolical. The narrative is crammed with so much that it's a genuine pleasure to revisit it a second (or third) time to appreciate how detailed and ingenious the script really is. Directed by Herbert Ross. With Yvonne Romain as Sheila.