Mandy Lane is lusted after all by all the boys at her school. She a virgin, she's unattainable, she's slightly withdrawn but seems nice, she's athletic, she's friends with a bullied male outcast. At a party, the outcast tries to defend from a lecherous bully and later sits on a roof overlooking the pool where all the kids are. The bully, drunk but behaving decently, tries to get into coming down, but the outcast talks him into jumping off the roof into the pool. He says he'll jump too but he doesn't and the bully breaks his neck.
Several months later, Mandy is no longer friends with the outcast as a result of the incident and has agreed to go away to a ranch for a weekend with three boys (absent parents of one of the boys own it) and two girls. All the boys want to get into her pants, two of them are pains in the arse, one of them (the black kid) is okayish, both the girls are bitches. There's a macho good guy ranch hand.
Then someone starts killing the kids.