Marius is a master of deceit and misdirection. When a group of parents arrive at his exclusive island resort, he tricks them into boasting how they secretly hate their children, and videotapes it all.
Meanwhile his teenage son Damian is still on the mainland, preparing to bring the group's children a few days later. Damian tricks the children the same way, covertly filming everything.
Once both groups are on the island, Marius convinces the parents that the children lured them to the island to kill them, and vice versa.
Although the parents rely on brute force and guns, the children employ clever tricks to leave their parents beaten up, exhausted, and ready for a truce.
At this point everyone realizes Marius duped them. The parents and children join forces and destroy Marius, who had planned on hunting down whoever survived the battle.