Two newlywed couples - Cliff and Sidney, Nick and Gina - come to the Hawaiian Islands for vacation. When they first arrived in Hawaii, they had a great time. The seawater, beaches, sunshine, and handsome men and beauties all made them linger. Cliff and Sidney are a couple with a very adventurous spirit. They looked for deserted beaches alone on the islands. Their efforts were rewarded when they discovered an undeveloped beach in a shady area. Thus, here became their top choice for honeymoon - they believed they had found paradise. However, this kind of heavenly peace was soon broken: a group of panicked tourists ran around the island and accidentally stumbled upon Cliff and his wife. From them, Cliff learned that there was a terrifying mental patient on the island who was killing the tourists one by one. After knowing this, Cliff's couple were in a dilemma - should they stay or pack up and go back to the city? At this time, another couple, Nick and Gina, were also racking their brains over whether to return to the city to end their honeymoon or stay in Hawaii to enjoy the sun. As the two couples hesitated, the killer began to act again, making things worse. The earthly paradise has become a hell on earth. On this small island far away from the city, civilization, and industry, who can they trust? And will they be able to survive?