Synopsis
A year after Sheila is killed in a hit-and-run, her multimillionaire husband invites a group of friends to spend a week on his yacht playing a scavenger hunt-style mystery game—but the game turns out to be all too real and all too deadly.
Cast

Richard Benjamin
Tom Parkman

Dyan Cannon
Christine

James Coburn
Clinton Greene

Joan Hackett
Lee Parkman

James Mason
Philip Dexter

Ian McShane
Anthony Wood

Raquel Welch
Alice Wood

Yvonne Romain
Sheila Greene (as Yvonne Romaine)
Pierre Rosso
Vittorio
Serge Citon
Guido
Roberto Rossi
Captain
Elaine Geisinger
American Woman
Elliot Geisinger
American Man
Jack Pugeat
Silver Salesman
Maurice Crosnier
Concierge (uncredited)
Martial
Locksmith (uncredited)
More like this

The Woman in Cabin 10

Evil Under the Sun

Appointment with Death

The Thursday Murder Club

Stolen

Death on the Nile

A Haunting in Venice

The Limits of Control

The Bourne Identity

Night Moves

Hangman

Wake Up Dead Man: A Knives Out Mystery

Querelle

Lady in Cement

Tony Rome

The Two Jakes

Stowaway

See How They Run

Bodies Bodies Bodies

American Gigolo