The Last of Sheila (1973) - starring Dyan Cannon, James Coburn, Raquel Welch, James Mason, Ian McShane, Joan Hackett & Richard Benjamin.
It was written by Anthony Perkins & Stephen Sondheim - apparently inspired by the elaborate games and scavenger hunts they planned for their friends.
The plot seemed like it would be right up my murder-mystery-adoring alley, but while watching it I wasn't exactly consumed with an intense curiosity to figure out the puzzle. Not bad though. Not bad.
Imagine dying knowing that your cause of death was strangulation by puppet.
See all the previous movie posts here.