Year: 2017
Runtime: 86 mins
Language: English
Director: Chris Sivertson
Sam Maddox, a girl struggling with her father's suicide, has a reputation at her high school. She begins a relationship with Henry Sinclair, a brilliant student headed to MIT. Despite their differences, they are drawn to each other, but Sam is unaware that Henry is consumed by a dangerous romantic obsession. As their relationship intensifies, Henry’s fixation escalates, and he’s willing to do anything to protect his romance, even resorting to violence against anyone who threatens it.
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Read the complete plot breakdown of Heartthrob (2017), including all key story events, major twists, and the ending explained in detail. Discover what really happened—and what it all means.
Shortly after high school graduation, Henry, Keir Gilchrist the shy valedictorian, crosses paths with Samantha, Aubrey Shea, a girl whose reputation at school is that of a bimbo. They clash at first, debating the gaps in each other’s perceptions, but a sincere apology from Henry and a kind gesture—offering Samantha a ride home after her shift—begin to plant the seeds of something more tender. What starts as a tentative romance quickly swells into a bright, almost reckless happiness for Henry, who feels as if he’s found someone who truly sees him. He carries that moment of connection with him as a beacon, savoring the new warmth that her presence brings to his otherwise quiet life.
Yet the bloom of their romance encounters a harsh weather front. Henry’s joy gives way to insecurity as he confronts Samantha’s past relationships, and his feelings darken into obsession. He grows possessive, convinced that Samantha might be pulled away from him by unseen pressures and jealousies he cannot bear to admit. His mounting fear twists into violence, and in a brutal turn of events he kills Dustin, her close friend, a shocking and irreversible act that marks the point of no return for his unraveling. The murder drives a deeper wedge between them, as Henry doubles down on the belief that those around Samantha threaten their bond.
As the relationship strains under this weight, Henry’s ambitions collide with his mother’s expectations. He is accepted to MIT, the prestige program his mother, Colette Sinclair, Felicity Price has long urged him toward, but his attachment to Samantha tempts him to stay in town instead. Samantha, aware of his escalating fixation and increasingly controlling impulses, ultimately breaks up with him so he can pursue the chance to attend a university she doesn’t want to derail. The split seems to give him a sense of temporary relief, but the underlying tension remains, and Henry’s insecurity continues to seep into his decisions.
Driven by the belief that Samantha is being pressured into leaving him, Henry widens his targets, fixating on those he sees as threats to their relationship. The consequences escalate as he eliminates those he perceives as obstacles, a sequence that intensifies the storm brewing inside him. After a call to Samantha where he pretends that everything can still work out, he invites her to his house to celebrate what he claims is a new plan with MIT. The dinner that follows becomes a chilling turning point: Samantha hears a disturbance from upstairs and discovers Henry’s mother, Colette Sinclair, bound to a chair, a terrifying image that reveals how far Henry has gone. In a moment of cold calculation, Henry presents a choice—either release his mother or kill her—to resolve their mounting relationship crisis, confessing that he was responsible for Dustin’s death.
Samantha refuses to be pulled back into the dangerous spiral. She convinces Henry to release his mother, who escapes through a window and flees into the night, crying out for help. Henry begs Samantha to run away with him, but she stands firm in her resolve to leave the cycle behind. In that fragile, final moment, he acknowledges that Samantha is different from everyone else—she doesn’t need someone else to define her, and yet she did love him in her own way. He utters one last, devastating admission and then stabs himself, choosing to end the torment at the cost of his life.
Two days pass before Samantha receives Henry’s journal in the mail, a private archive of their time together that she chooses to keep to herself. Her shrink weighs in, describing the relationship as unhealthy, yet there is a quiet acknowledgment that Henry loved her in a way she could not fully accept or understand. She reflects on their shared moments, the intensity of their connection, and the odd, bright thread of affection that persisted despite everything.
The ending returns to the skating rink—the place that first brought them together. Samantha sits on the floor where Henry once brought her for their first date, allowing the memory to wash over her with complex emotion. In a moment of poignant longing and regret, she voices what she never said while he was alive: I love you, Henry, a confession that feels both earned and heartbreakingly incomplete, as she contemplates the path they could have walked together, had things been different.
Last Updated: October 09, 2025 at 15:48
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