 Last of Sheila is another movie set at sea on a boat, but maybe a different kind of terror in the water. This is a murder mystery whodunit, and it was written by Anthony Perkins and Stephen Sondheim, and it was inspired by their love of parlor games. It's about a group of Hollywood friends who are invited to go on a pleasure cruise, and they are invited by their friend, a producer, who is mourning the death of his wife in a hit-and-run accident, and he uses this parlor game to