When Strangers Appear

In an abandoned secondary road, Beth owns a diner and a motel inherited from her father. Every day she needs to walk on a lonely road from the hotel to the diner. One day, when she opens her diner, the starving and moneyless Jack Barrett arrives, and she serves a free meal to him. Soon three surfers - Peter, who is the leader, Stephen and Roger - arrive at the diner and Jack hides himself in the kitchen. The trio asks for meal and Peter is nice with Beth. When they leave the place, Beth talks to Jack and takes him to a room in her motel. She finds that he is stabbed on the belly and drives him to her only friend in town, Dr. Eric Leonard..She does not want to call the local Sheriff Bryce, who raped her in the past, but when Dr. Leonard records a strange message in her answering machine, she calls Bryce and asks him to investigate his clinic. Bryce sees a notice saying that the clinic will be closed for a few days, and he does not enter the clinic. Beth meets Peter and asks him to go with her to the clinic, where they see blood everywhere and Dr. Leonard and Jack missing. When she sees Jack, he tells her that Peter and his friends killed Dr. Leonard and will kill them. Who is telling the truth?