One night, a boat reaches
Snape Island. Two seamen go on shore and find a male corpse with a severed hand. They enter a lighthouse to investigate and find a female body with a severed head. They split up and find another murdered person. Then they find a young woman, Penny, hiding in a closet. Traumatized, she fatally stabs the older seaman. The other man—the boat's captain—survives. Penny is later examined by doctors. Shocked, she eventually starts talking and remembering how her friends arrived. The flashbacks make her scream. After hearing about this, scientists decide to visit Snape Island, which is loaded with gold and Phoenician treasures. The team, consisting of five men and two women, sets out on the Sea Ghost, a boat captained by the surviving seaman. After landing, they notice a lack of sea gulls and other forms of life. They suspect that the island has another inhabitant. Their leader, Dr. Simpson, looks at a stashed away sack. The captain sees a picture of his brother in the mansion. He reveals that his brother, sister-in-law and their child died on the Island. The scientists eventually hear an unusual noise and split up to look for the cause. After everyone reunites, Dr. Simpson says that he will check on the boat. Before leaving, he says that the three young people must have been murdered by a madman who may still be on the island. While two scientists have sex, the rest of the men go out to look for the Doctor and find that someone blew up the boat. One of the scientists having sex runs to the boat. The other one, Nora, wanders alone and is stalked by the murderer, a bearded madman. She sees a decomposing body in a rocker, screams and passes out. The others come running and find Nora and the body. They demand answers from the captain. He reveals that the corpse is his sister-in-law and that his brother Saul is still there, living in the caves under the house. The madman also destroyed their radio. The men decide to go in pairs to find Saul. The women, consisting of Nora and her friend Rose, stay inside. The captain and his search partner find Saul's cave. Rose hears someone weeping, investigates and eventually sees Saul rocking the corpse of his dead wife. He hears Rose and, while stalking her, finds Nora, who runs to the top of the lighthouse. There Saul throws her off onto rocks. Seeing that Nora is dead, Rose and the two other men go into a cave together. Meanwhile, the Doctor, who is near a coffin, finds the treasure. He hears the unusual sound again and pursues it. After he leaves, the captain's search partner finds the treasure. After looking it over, he hears Saul laugh. Saul then crashes in on him. The remaining five meet up in the cave. The Doctor explains that he fired his gun at Saul and was stalking him all night. The unusual sounds returns. Rose and scientist Dan stay with the treasure while the captain, the Doctor and the other man go looking for Saul. Saul eventually attacks Rose. Dan comes to help, but Saul breaks his neck. With all of the screaming, the three men reappear and shoot Saul dead. The Doctor reveals that he has been to the island before. On the other side of it, he left a boat and supplies. The captain stays with Rose and the two other men go to get the boat and some of the artifacts. Then Rose and the captain go inside the lighthouse. The captain says that Martha never wanted his brother Saul to be reported. The captain then goes upstairs to get some sleep but later returns bleeding. He mentions Michael, Saul's son, and dies. Then, the deformed Michael attacks Rose. She throws an oil lamp at Michael and sets him on fire. As he burns to death, the house and cave catch on fire as Saul had it rigged to. Rose escapes and the two surviving men leave the cave to watch the house and its dwellers burn. ==Cast==