L'assassino Ha Riservato Nove Poltrone (1974)

Patrick Davenant with some family and friends went, after a party, to visit an old theater owned by the family, never used but always kept in order. The relations between them are not the best. On arrival they are greeted by a mysterious man who, it turns out later, no one knows. Patrick Kim is to marry his second wife; with them there is also Vivian who was to marry an year earlier. The theater bears a curse for centuries according to which every hundred years it will become a coffin for all those who enter. And in fact the doors do not open, the phone does not work and an attempt to kill Patrick is unsuccessful...