When his girlfriend Sasha and best friend Elias give hothead Richard a harpoon for his birthday, he wants to try this new toy out right away. So the three of them set out for a day trip on a boat, but suspicion and jealousy soon start to get the upper hand. Before long, the tension has become unbearable. To make matters worse, the boat’s engine fails and then it turns out they left their supplies on shore: a nerve-wracking struggle for survival ensues that spares no one’s secrets – or blood.