The Puppets(1967)

Original title: Os Fantoches

Aníbal is a millionaire, knowing that he is going to die, invites a group of relatives and friends to stay at his luxury hotel. They are all linked to a mystery of their past. Some will be rewarded with inclusion in the will; others will be punished. To know who was his real friend and who harmed him, Aníbal starts to manipulate everyone, as if they were puppets.