The Sweetheart (2018) Plot Summary & Ending Explained

The conclusion of Sweetheart sees the protagonist, Jenn, shift from a state of desperate survival to one of empowered resistance. After her boyfriend Lucas and his friend Mia refuse to heed her warnings about the creature—instead choosing to gaslight and physically restrain her—their denial leads to their demise. Mia is killed by the beast, and though Lucas momentarily redeems himself by saving Jenn from the water, he is ultimately overpowered and killed. Stranded with a destroyed raft and no allies, Jenn realizes her only path to freedom is to stop running. In a decisive final stand, she lures the creature into a trap, using sharpened sticks and a pocket knife to fatally wound the beast, ending its reign of terror over the island.

With the monster dead, Jenn sets the island ablaze to create a massive signal, hoping the smoke will attract the planes she previously spotted. The film leaves her rescue somewhat ambiguous; she is alive and victorious, though physically exhausted and potentially still threatened by the implication that other creatures may dwell in the vast underwater hole. However, the sheer scale of the fire suggests that her chances of rescue are high, marking a triumphant end to her physical ordeal. The destruction of the creature serves as a definitive closure to the immediate horror, allowing her to shed the fear that plagued her nights.