Last Straw

After discovering that is pregnant, the waitress of the diner Flat Bottom Bistro Nancy Osborn drives to work but her old car breaks down and she needs to walk. She gets a bicycle ride from a co-worker and arrives late, and her father Edward Osborn, who owns the diner, calls her attention since he has just promoted her to manager. He assigns her to the night shift and goes to meet his girlfriend. When a group of masked teenagers driving mopeds arrives at the diner to disturb them with pranks, Nancy pretends to call the police, and the guys leave the place but promise to return later. However, the employees Jake Collins, his brother Petey, Bobby, who has a crush on her, and Coop do not help her. They have an argument, and Jake offends Nancy and says that she is the manager only because the diner belongs to her father, and she fires him. During the night, Nancy stays alone and out of the blue, she is scared by masked men. She calls the police, but they are not able to immediately come since they are attending another case, and they believe it is a prank of teenagers. However, Sheriff Brooks arrives at the diner to calm Nancy down and does not give much attention to her. But when she mentions the mopeds, the Sheriff immediately asks her to go with him to his car since he has just come from a massacre of teenagers with mopeds. But he is killed by the masked man with a hammer and Nancy runs and hides herself. Who are the killers?