Un grupo de adolecentes mata accidentalmente a un sujeto en la fiesta del 4 de julio. Todo el grupo de amigos decide mantener el secreto hasta la muerte. Están convencidos que ninguno de ellos hablará pero, justo un año después, lo secreto vuelve para vengarse...

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.