Heart Eyes

Each of the past few years on Valentine's Day, a serial killer known as the Heart Eyes Killer, or HEK, has targeted couples in a different American city. On Valentine's Day of the present year, HEK murders two couples in Seattle and a wedding ring engraved with the initials "J.S." is later found at one of the crime scenes. Ally McCabe, a marketer for a jewelry company who has recently broken up with her boyfriend Collin, is ridiculed for an ad campaign she pitched involving doomed couples, seen as offensive in light of the recent murders. Ally's boss, Crystal, orders her to develop a new campaign with accomplished freelancer Jay Simmonds, whom Ally had encountered at a coffee shop earlier. Jay invites her to dinner that night, suggesting it may give them inspiration for the campaign. That night at the restaurant, Ally grows hostile after each share their views on love, offending Jay. He leaves and Ally follows, kissing him after she sees Collin approaching with his new girlfriend. HEK observes this from a distance. Ally and Jay reconcile and take a cab to her apartment, where he helps her break in after she realizes she forgot her key. Jay cuts his hand in the process and Ally tends to his wound upstairs, having previously dropped out of medical school. The Heart Eyes Killer attacks them and after a chase, knocks Jay out. Ally is able to flee until the police arrive. Detectives Zeke Hobbs and Jeanine Shaw arrest Jay for the murders, having found him with the killer's mask and weapon. While questioning Jay at a police station, Hobbs and Shaw point out that his initials match those on the previously found ring and that he was in the same cities during HEK's previous attacks. Ally waits in the lobby with desk officer Fran and IT technician David. The latter asks Ally on a date, but she declines. The power goes out and the Heart Eyes Killer kills Fran and pursues Ally. Shaw confronts the HEK who wounds her and kills Hobbs. Ally rescues Jay and they flee to a drive-in movie theater, where they connect while hiding. The Heart Eyes Killer slaughters several moviegoers, leading the duo to confront him. In the scuffle, Ally and Jay kill him with his own weapon and unmask him but don't recognize him. They are tended to by an ambulance until Shaw arrives. She offers Jay a ride, which he accepts. At home, Ally realizes she has fallen in love with Jay and goes to find him, but the Heart Eyes Killer reveals that Jay is being held at a chapel and will be killed unless she comes alone. Ally arrives and the Heart Eyes Killer is revealed to be David and Jeanine Shaw, secretly a married couple, while the deceased third killer was their fanboy and lover Eli, all three motivated by their kink for killing. The wedding ring found by police belonged to David as the engraved initials were Shaw's. They give Ally a gun with a single round and offer her the choice of killing herself or Jay, but she shoots Shaw instead, hitting Jay in the process. The two couples fight and Jay stabs David in the eye with an arrow, which results in him being immolated by melted wax from candles the couple had lit. An enraged Shaw attempts to kill Ally, but Ally stabs her in the neck with a metal straw and pushes her onto the sword of a statue of Saint Valentine, which slowly decapitates her. A badly burned David attacks them, but is killed with his own crossbow by Jay. One year later, Ally has decided to return to medical school and the couple attends a drive-in movie. Jay asks Ally to move in with him, but she declines, instead proposing to him. In a mid-credits scene, Ally receives a sinister phone call, which is revealed to be a prank by her friend Monica. As she congratulates the couple, the call is cut off.