The Stalker 1

The Stalker 1 (also known simply as The Stalker) is the first film in The Stalker series.

Plot
In the town of Ridgecrest, teenager Kris Strode is home alone, waiting for her boyfriend, Jason, to arrive. After getting off the phone with her friend Alex, Kris experiences a number of strange occurrences, such as the phone and doorbell ringing, with no answer, and the lights suddenly going out. After her doorbell is rung a second time, Kris discovers Jason's murdered body on the doorstep. Soon after, Kris herself is attacked and murdered by a costumed killer, The Stalker.

The next day, the news of Kris and Jason's murders has spread across town. Kris' schoolmates, Katie Barcley and Jen Yates, are shocked by the news and head over to Alex's house on their way to school, to see if she's alright. Alex is traumatized by Kris' murder and refuses to answer the door. Katie and Jen continue on to school. After school, Jen and Katie hang out with Jen's boyfriend tom Matthews and her twin brother Adam, who went out with Katie - however, she recently dumped him after discovering he'd cheated on her. Jen says her mother, Debbie, is convinced there's a serial killer on the loose and is reluctant to let her leave the house; Katie comments that her own parents are out of town - her mother and sister are overseas and her father, Richard, is on a business trip. When Adam comments "nothing like a murder to get me and Katie talking again" Katie storms off in disgust.

At home, Jen calls Katie and suggests they go to Alex's house to check on her again - Katie agrees to meet Jen, but falls asleep, waking up after dark. Jen calls her again and Katie confirms she's coming. Not long after, however, Katie gets a strange phone like the one Kris received - she is subsequently attacked by the Stalker. Katie manages to knock the Stalker down and narrowly escapes with her life. Later that night, Alex is watching TV when a news reporter annouces that Katie survived an attempt on her life, shocking Alex. She herself encounters the Stalker soon after - she hides and attempts to flee in her car, but it won't start; when Alex looks in the rear-view mirror, she sees the Stalker sitting in the backseat and it is heavily implied she is murdered.

The next day, Katie is picked up from hospital by Jen, who says there was another victim last night and offers to let Katie stay with her until her parents come home. At school, Katie is disgusted that Adam hasn't come to see if she's alright - Jen, for once, chastises her, saying that Adam was very upset upon learning that Katie was attacked. Tom reminds the girls that he is throwing a party celebrating his birthday at his house tonight - Katie initially states she doesn't want to go, but Tom convinces her. At Tom's party, Katie is informed that Adam wants to speak with her and she reluctantly goes upstairs to talk to him. Adam apologizes to Katie and professes his love for her; Katie realizes she still loves Adam and forgives him, and the couple end up sleeping together. Meanwhile, Jen's drink is spiked and she ends up passing out in a bedroom. When she wakes, she discovers that the other guests have been murdered and is chased by the Stalker, attempting to hide in the bathroom.

Katie herself wakes up some time later, only to discover Adam is missing. Upon searching the house, Katie stumbles across the bodies of the party-goers and is attacked by the Stalker. Katie hides in the bathroom, where, to her horror, she finds Jen's body in the tub. After she is sure the coast is clear, Katie tries to sneak out of the house and bumps into her father, who has just returned from his trip and came looking for Katie after hearing about the murders, concerned for her safety. He comforts Katie over Jen's murder. At that moment, Adam walks out of a nearby closet, claiming he was hit over the head and locked in. Richard is suspicious of Adam and accuses him of being the killer; Adam retorts that its an odd coincidence that Richard should turn up just as the killer disappered, whilst Katie tries to stop them. When Richard says that Adam is acting like he doesnt even care that his sister was "hacked to death with a butcher's knife" a distraught Adam runs off to be sick. Katie then realizes that its odd that her father knows how Jen was killed and she questions him about it. After Richard fails to give a satisfactory answer, a shocked Katie realizes that her own father is the Stalker and faints in terror. When Adam returns, he is suspicious of Richard's behavior and realizes the truth when he sees Katie out cold. Adam flees but cannot bring himself to abandon Katie, who come to and tries to sneak out, but is caught by Richard. Adam is suddenly stabbed by another Stalker, revealed to be none other than Tom.

Tom explains that he was always in love with Katie and decided to commit the murders so that they could "be together". Katie sobs that his plan is "crazy" - Richard suddenly says he agrees and fatally shoots Tom, then beats Katie to unconsciousness. Katie wakes to find herself tied to a chair, Richard standing over her with a knife. When Katie tries to reason with him, a furious Richard reveals he is not Katie's real father - she was actually conceived after her mother was raped. Richard has always despised Katie, viewing her as a blight on his otherwise 'perfect' family. Richard coerced Tom into helping him to commit the murders, but always planned on betraying and framing him for the crimes. Katie begs Richard not to do this to her mother and sister, but Richard refuses to listen. Just as he is about to stab Katie, however, Richard is shot and killed by Adam, who was only injured and faked his death. Katie and Adam are seen sitting outside the house together - the sole survivors - surrounded by police and paramedics.