Friday the 13th (1980)

A group of camp counselors are stalked and murdered by an unknown assailant while trying to reopen a summer camp which was the site of a child's drowning and a grisly double murder years before.

About

The first film in the Friday the 13th franchise about a group of young camp counselors who are hunted down and murdered by an unknown slasher. 

Trivia

The movie was filmed in New Jersey at Camp Nobebosco. Several years after the film was released, Simon Hawke adapted the story into a novel of the same name.