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Released in 2020, The Block Island Sound is an eerie and atmospheric thriller directed by Kevin and Matthew McManus. The film masterfully blends psychological horror with elements of science fiction and ecological mystery, delivering a slow-burning and deeply unsettling experience. With a strong central performance, an ominous tone, and an unsettling narrative, The Block Island Sound stands out as a unique indie horror film that lingers in the mind long after the credits roll.
The film is set on Block Island, a small, isolated stretch of land off the coast of Rhode Island. The story follows Harry Lynch (Chris Sheffield), a troubled local who begins noticing strange occurrences in his community. Dead fish wash up on shore in alarming numbers, birds fall from the sky, and the people around him—including his father, Tom (Neville Archambault)—exhibit increasingly erratic behavior. When Tom is found dead after exhibiting symptoms of paranoia and confusion, Harry is left to piece together the mystery of what’s happening on the island.
Harry’s sister, Audry (Michaela McManus), a marine biologist, returns to Block Island to investigate the environmental anomalies. As she searches for scientific explanations, Harry spirals into his own descent of fear and madness, as he experiences blackouts and strange auditory hallucinations. The more he tries to understand what’s happening, the more he begins to suspect that something far beyond human comprehension is at play.
One of the strongest elements of The Block Island Sound is its atmosphere. Alan Gwizdowski's cinematography perfectly captures the bleak and isolated beauty of Block Island, emphasizing its small-town eeriness and vast, foreboding oceanic surroundings. The desaturated color palette, combined with hauntingly quiet scenes, creates an oppressive and unsettling environment.
The film thrives on minimalism—there are no jump scares or excessive use of CGI. Instead, it relies on a creeping dread that builds throughout, reinforcing the idea that something is wrong but never fully revealing what it is until the final moments. Another highlight is the sound design, which is crucial to the film’s effectiveness. The low, guttural hum that echoes throughout the movie is a key motif, acting as both a physical and metaphorical presence that drives the characters toward their fates.
Chris Sheffield delivers an exceptional performance as Harry, the emotionally unstable protagonist. His descent into paranoia is subtle yet effective, and he brings an authenticity to his role that makes his struggle feel real and relatable. The film does not rely on exaggerated horror tropes but instead focuses on real human emotions—grief, isolation, and fear of the unknown.
Michaela McManus, as Audry, provides a grounded and rational contrast to Harry’s unraveling psyche. Her scientific background makes her a skeptic, and her attempts to explain the island’s abnormalities through logic add an intriguing layer of conflict between belief and disbelief. Neville Archambault, as their father, delivers a brief but haunting performance, particularly in the film’s opening sequences, where his erratic behavior sets the tone for the unsettling narrative to follow.
The supporting cast, including Audry’s young daughter and local townspeople, helps add to the realism of the setting. They react to the events with varying degrees of concern, avoidance, or outright denial, mirroring how a small community might deal with unexplained and terrifying events in real life.
Beyond its surface-level mystery, The Block Island Sound delves into deeper themes, including grief, mental illness, and humanity’s relationship with nature. At its core, the film explores the idea of losing control—whether to personal demons, unexplained forces, or the overwhelming power of the natural world. Harry’s struggle with his blackouts and his paranoia-driven outbursts can be seen as metaphors for hereditary mental illness, passed down from his father.
The film also subtly critiques humanity’s tendency to disregard environmental warning signs. The mass deaths of fish and birds suggest a larger ecological disaster, one that characters attempt to rationalize through science, yet never fully grasp. The inexplicable nature of these occurrences leaves the audience questioning whether mankind is truly at the top of the food chain or if there are greater forces at play.
Without giving away too many spoilers, the film’s climax leans heavily into the realm of science fiction, drawing comparisons to Lovecraftian horror. The true nature of the force behind the disturbances is hinted at rather than explicitly revealed, which adds to the overall unease. This ambiguity works in the film’s favor, keeping the horror rooted in psychological distress rather than outright supernatural or extraterrestrial horror. The less the audience knows, the more terrifying the implications become.
While the film’s slow-burn approach adds to its sense of dread, it may not appeal to viewers who prefer fast-paced horror. The plot unfolds gradually, with much of the first half spent establishing character dynamics and the eerie setting before the real horror elements take center stage. However, for those who appreciate atmospheric tension and psychological depth over traditional scares, the film’s pacing is a strength rather than a weakness.
The film also does not provide easy answers. Much is left to interpretation, and the final moments do not wrap everything up neatly. Instead, they leave the audience with lingering questions and a profound sense of unease, making the experience all the more haunting.
The Block Island Sound is an intelligent and unsettling horror film that expertly blends psychological terror with cosmic horror. Its slow-burn storytelling, eerie atmosphere, and thought-provoking themes set it apart from standard horror fare. While it may not appeal to those seeking conventional scares or action-packed sequences, it offers a deeply immersive and unsettling experience for those willing to embrace its ambiguity and tension.
With strong performances, an eerie soundscape, and a compelling mystery, The Block Island Sound is a must-watch for fans of cerebral horror and indie filmmaking. It proves that true horror does not need excessive gore or supernatural monsters—it only needs an unsettling question that lingers in the back of your mind long after the film ends. If you enjoy films like The Witch, The Endless, or It Comes at Night, this eerie and thought-provoking thriller should be on your watchlist.
SPECIAL FEATURES:
- Audio commentary with directors Kevin McManus and Matthew McManus
- Original Trailer
- A Practical Apocalypse
- Finding the Cast
- Filming on the Water
- Special Effects on a Shoestring
- Los Angeles Behind-the-Scenes (Super 8mm)
- McManus Family Home Movies
- The 4K UHD release features a special limited edition slipcover featuring new art from Joel Robinson, while supplies last
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