A group of businessmen and their wives travel to an island in an attempt to buy the rights to a mysterious formula. Once there, the only boat is sent away and the party members begin to be murdered off, one by one.
A group of Italian businessmen and their wives gather on an island for a "mysterious" meeting. Once everyone has arrived, the boat is sent away, leaving everyone to enjoy a weekend of partying in an attempt to wine and dine a professor who has developed a very important formula for industrial resin. It turns out the men are trying to purchase the formula, but the professor that isn't interested in selling it, preferring to present his findings to the scientific community in the hopes that it can be used for the good of mankind. Soon after the boat leaves, however, the houseboy is found murdered on the beach and the only means of communication with the mainland has been cut off. It seems that someone is killing off the party goers one by one and everyone on the island has a secret. Unable to contact the police and without any means of leaving the island, the group must discover who is behind the killings: a cheating wife, a jealous husband, or someone willing to do anything to get their hands on the formula? As tensions rise, everyone becomes more and more desperate to find a way off the island.