Sweetheart (2019) Plot Summary & Ending Explained

Jennifer Remming, known as Jenn, embarks on a perilous ocean adventure alongside her boyfriend, Lucas Griffin, her friend Mia Reed, and two unfamiliar faces, Brad and Zach. Their journey takes a calamitous turn when a violent storm devastates their boat, leaving Jenn stranded on a desolate island. She discovers that Brad also washed ashore, but tragically dies from his injuries. Jenn buries him, only to find his grave disturbed and his body missing the very next day.

While exploring the waters, Jenn encounters a chilling discovery—a seemingly bottomless black hole hidden beneath the ocean waves near the beach. In a desperate attempt to signal for help, she fires a flare at an overhead plane, but her timing is off, leading to a horrifying sight of a menacing creature lurking in the shadows of the water.

Struggling to survive, Jenn takes refuge inside a hollow log as nightfall descends. However, the creature assaults her makeshift shelter but retreats at dawn. On her quest for safety, she sets bait using a small shark she catches by spear-fishing, yet the creature continues to elude her, only leaving destruction behind. When Zach's body washes ashore, adorned with strange knife wounds, Jenn tries to use it as bait, but the beast remains elusive.

To escape the creature's grasp, Jenn constructs a suspended hammock, hoping to sleep out of reach. Yet, her attempts remain thwarted as the beast pulls her down, forcing her to hide until its departure at dawn. After what feels like an eternity, Lucas and Mia finally arrive on the island in a raft. Jenn urgently warns them about the ominous monster that drags its victims to the ocean's depths, but her claims fall on deaf ears. Feeling neglected, she attempts to escape in the raft alone, only to be stopped by Mia, who knocks her out while Lucas ties her to a tree.

Upon regaining consciousness, Jenn confronts Lucas about their troubled relationship and presses for answers regarding Zach's fate. Their tense exchange is abruptly cut short when the creature strikes again, this time snatching Mia from the beach and dragging her into the thundering waves. Determined to escape, Jenn and Lucas gather supplies and embark on a journey across the ocean, but Jenn's discovery of blood on Lucas’ pocketknife raises red flags in her mind.

Everything comes to a head when the creature attacks their raft, dragging Jenn beneath the surface. In a frantic fight for survival, she uses Lucas' pocketknife to defend herself, but he finds himself ensnared by the beast, disappearing into its gaping hole. Left alone, Jenn reverts to the island, crafting weapons from kindling and makeshift spears, preparing for the inevitable clash with the creature. As night envelops the island once more, she confronts the monster in an explosive showdown, determined to defeat it once and for all.

At the end of Sweethearts, it’s clear that Ben and Jamie’s relationship has evolved into a pure platonic friendship after their emotional and awkward encounter. Throughout the story, it’s evident that both had feelings for each other, but they consciously decided to remain just friends to avoid complicating their lives further. After Katie's confrontation, Ben and Jamie reaffirm their decision not to pursue anything romantic, choosing instead to focus on their individual futures—Ben plans to go to Copenhagen, and Jamie aims to socialize more and open her heart to new experiences. Their mutual understanding allows them to part ways on good terms, without resentment or regret. The ending emphasizes that sometimes, genuine friendship can be more meaningful than romance, especially when feelings are ambiguous or unreciprocated. However, the story leaves a hint of ambiguity about the future, implying that human emotions are unpredictable, and if a sequel were to be made, the characters might inevitably face new challenges as feelings develop or change. For now, though, Ben and Jamie’s goodbye feels optimistic and hopeful, illustrating that even after complicated emotional moments, genuine connections can remain strong if based on honesty and respect. Their journey underscores the idea that understanding oneself and respecting boundaries are crucial, and in doing so, they part ways knowing they value their friendship above all.