Moon in Scorpio

This article is about a 1987 film. For the 1996 music album see Moon in the Scorpio

The couples meet on the boat and set sail. During the voyage, war time flashbacks show the three men committing atrocities during their tour of duty in Vietnam to include the murdering of innocent villagers. The men are clearly troubled by this and tensions on the ship, some of which are sexual, begin to rise. Soon, the boat is vandalized, rendering some of the navigation and communications equipment inoperable. Isabel begins acting erratically and mentions several times that when the moon is in scorpio, bad things happen. In a short period of time, Mark, Burt and Claire are gruesomely killed, leaving only Linda, Allen, and Isabel as the survivors. Allen is killed later as Linda looks for him on the yacht, she surprises Isabel who is in possession of the murder weapon, an oddshaped grappling hook.Isabel tries to kill Linda and the two women fight each other. The fight ends when Linda overpowers Isabel and stabs her to death with the grappling hook. The entire story is told via flashbacks, from Lindas point of view, as she is the only survivor. The movie opens with an unseen person escaping from a mental institution and Linda in a hospital being comforted by a doctor. The movie closes with Linda being released from the hospital, after she has narrated her story the police. ........

Source: Wikipedia