The Block Island Sound

Tom wakes to a chaotic scene aboard his fishing vessel off Block Island, finding the boat disheveled and equipment out of place. A wider sense of strangeness grips the island as reports of dead fish begin washing ashore. He scans the horizon, unsure of what happened as the world around him feels off-kilter.

Harry, Tom's son, starts noticing odd behavior in his father—nighttime trips on his boat and moments when Tom becomes unresponsive during conversation. The family grows concerned as the man they know seems to slip away. The tension on Block Island intensifies as days pass.

Audry, Tom's other daughter, is sent from the Rhode Island mainland to investigate the wildlife disturbances with her colleague Paul. She brings her daughter Emily along, hoping to gather data and keep the family together. The investigation officially begins as they arrive on the island.

Audry and Paul start documenting the unusual wildlife events while Harry tries to connect with Emily by teaching her to fish and catch frogs. The household dynamics become tangled as Tom's absence lingers and the strange phenomena escalate. They record odd animal behavior and episodes that hint at a larger pattern.

That night, Tom sneaks out on his boat and vanishes, leaving his family fearing the worst. Later, the police confirm his disappearance when his body washes ashore, sealing the belief that he drowned. The island reacts with grief mixed with a chilling sense that something unseen is at play.

Jen, Tom's estranged sister, returns from New York for the funeral, forcing Harry to confront his trauma. Harry's mental state deteriorates further as the weight of his father's death and the strange happenings bear down on him. A confrontation with an older man during the funeral scene underscores his unraveling.

Driven by a need to understand what happened, Harry borrows scuba gear and dives at the drowned-site, only to black out underwater. He wakes on the fishing vessel with its electronics scrambled and a strange sound filling the cabin. The boundary between reality and signal-noise blurs as something unseen seems to pull at the boat.

While driving after dropping Jen at the ferry, Harry experiences a vision of his father that distracts him and leads to a deer collision. The accident deepens his paranoia and he drifts toward conspiracies and forces guiding him. The line between science and superstition begins to blur in his mind.

Audry takes Harry to a psychologist who speculates that he might suffer electromagnetic hypersensitivity caused by the Block Island Wind Farm. The doctor advises contacting a former patient who had a similar experience to learn what to do. The family remains unsettled as the doctor warns that danger could escalate if Harry isn't kept away from the island.

The former patient explains paranoia is driven by some otherworldly force that watches and influences people. He warns that someone could get hurt if Audry doesn't remove Harry from Block Island. The sense of impending doom weighs on the family as they try to protect Emily and themselves.

On the way back from the meeting, Audry drives to catch the last ferry, while Harry resists another vision and heads out for a nighttime drive. He nearly collides with a jogger and then attempts to attack her, interrupting any sense of safety. The house and island feel increasingly haunted as danger closes in.

Harry abducts Emily onto the fishing boat, as Audry fights to reach the vessel and reclaim her daughter. Paul is knocked unconscious during the chaos, and Audry and Emily barricade themselves in the cabin while the boat fills with a wailing, rattling sound. A supernatural ascent begins, lifting every object and person—including Harry—toward the sky.

Audry is carried up with the rising cabin as dawn approaches, and Emily watches in horror as the vessel becomes a silent, empty hull. The next morning, authorities find Emily alone in the boat's cabin, while Audry has been dropped into the ocean alive and treading water. A final voiceover recalls a biologist's justification for taking certain fish from their habitat to study them.