In a sun-soaked Hawaiian town with a mysterious past, a group of friends is left with a dark secret after a tragic accident. One year later, a member of the group receives a threatening message, and the friends now know that someone intends to make them pay for last summer.

Two teens, Lisa and Kim, are playing games making prank calls on the phone. But when they call Adrian Lancer who has some mental problems, and say "I saw what you did", they ignite a human time bomb. Adrian has just killed someone and thinks they saw him do it. Now he is trying to find them.

Several teenagers in a small-town in Colorado concoct a July 4th prank based on a frightening legend that goes awry when their friend ends up accidentally killed; however, the teens agree to keep their involvement a secret from the authorities, who continue to search for the man who apparently killed their friend. A year later, with the July 4th celebration coming up again, the teenagers realize that they're being stalked by someone who clearly intends on keeping the horrible legend alive by killing them off.

After an accident on a winding road, four teens make the fatal mistake of dumping their victim's body into the sea. Exactly one year later, the deadly secret resurfaces as they're stalked by a hook-handed figure.