Back from the Dead

After witnessing a murder, Julia is forced to keep quiet—until she receives a message from the dead boy and realizes she's in even more danger than she suspected
Julia reluctantly joins her cousin Nikki and her friends for a night of partying. Climbing into the hills, they spot Heath, a strange guy from school, and they chase him into a dilapidated cabin. Julia watches, horrified, as Nikki's friends set fire to the old building and wait for Heath to run out in terror. He never appears, and the cabin burns to the ground.
Julia knows she must go to the police. But Nikki and her friends threaten to kill Julia if she tells anybody what happened. But then Julia receives the note that changes everything: "You tried to kill me. For that you will die."