"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."
Richard Benjamin
as Tom Parkman
Dyan Cannon
as Christine
James Coburn
as Clinton Greene
Joan Hackett
as Lee Parkman
James Mason
as Philip Dexter
Ian McShane
as Anthony Wood
Raquel Welch
as Alice Wood
Yvonne Romain
as Sheila Greene (as Yvonne Romaine)
Pierre Rosso
as Vittorio
Serge Citon
as Guido
Roberto Rossi
as Captain
Elaine Geisinger
as American Woman
Elliot Geisinger
as American Man
Jack Pugeat
as Silver Salesman
Maurice Crosnier
as Concierge (uncredited)
Martial
as Locksmith (uncredited)
Herbert Ross
Director
Anthony Perkins
Writer
Mary Bredin
Hairstylist
Harry Frampton
Makeup Artist
Peter Frampton
Alaine Scemama
Mishka Cheyko
Assistant Director
William C. Gerrity
David Dockendorf
Sound Mixer
Derek Holding
Sound Editor
Richard Oswald
Cyril Swern
Sound Recordist
Dan Wallin
Sound Re-Recording Mixer
Fred Stromsoe
Stunts
Stephen Sondheim
Billy Goldenberg
Original Music Composer
Gerry Turpin
Director of Photography
Stanley O'Toole
Executive Producer
Producer
Edward Warschilka
Editor
Annabel Davis-Goff
Script Supervisor
Joel Schumacher
Costume Design
John Jarvis
Set Decoration
Ken Adam
Production Design
Tony Roman
Art Direction
Bob Penn
Still Photographer
Derek V. Browne
Camera Operator
Stanko Grozdanic
Production Supervisor
Malcolm Stamp
Unit Manager
Barry Wilkinson
Props
Tony Teiger
Property Master
Jack Coggins
Gaffer
W.C. 'Chunky' Huse
Key Grip
Robin McDonald
Clapper Loader
Michael Murchan
Rigging Grip
Eva Sereny
Brian Owen-Smith
Wardrobe Master
Ron Talsky
Harry King
Music Editor
Scoring Mixer
Hunt Downs
Publicist
Wayne Fitzgerald
Title Designer
Nora Kaye
Production Assistant
Don Zimmerman
Assistant Editor