The Unknown
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Author: Riley Sager
Published: 2026
Genre: Other Genre
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IBC Editorial Rating: 4/5
This book is handpicked by the IBC Editorial Team. If you are an author, publisher, or reader and would like to have a book reviewed by IBC, you may reach us at editorial@indianbookclub.com — we’ll be happy to review it.
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Editorial Review:
In 1926, five women vanished without explanation from a remote island commune in Vermont, leaving behind only five dresses hanging from a single oak tree. A century later, struggling actress Marin Keane lands the role of a lifetime in a film about the mystery, only to discover the production requires a weeklong research trip to the very island where the women disappeared. As Marin and her castmates settle into New Avalon's unsettling isolation, strange noises, cryptic symbols, and an unshakable diary from one of the vanished women begin to blur the line between the story they are filming and the one they may be living. When the disappearances start again, Marin must decide whether she is uncovering New Avalon's past or about to become part of it. Riley Sager delivers a gothic, atmospheric thriller built for exactly this kind of dread.
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Book Summary:
New Avalon has carried its mystery for a hundred years. In 1926, it was home to a small commune of spiritual mediums until all five women living there vanished, one by one, with nothing left behind but their clothing hanging from the branches of a single oak tree. No bodies were ever found, and the truth of what happened has lingered ever since, somewhere between local rumor and the unsettling diary of a young woman named Daisy Rue, who wrote of a séance that may have gone catastrophically wrong. A century later, that unresolved history becomes the subject of a major film, and struggling actress Marin Keane finds herself cast in the role that could finally launch her career. The production brings her, alongside acclaimed actress Violet Wright and ambitious director Ronan Peters, to New Avalon itself, where the cast is asked to live in conditions built for authenticity rather than comfort. It is not long before the isolation begins to feel less like a creative choice and more like a warning. Strange noises break the silence at night. Unfamiliar symbols appear where they shouldn't. And when a sudden emergency leaves the cast stranded on the island, the boundary between filming a disappearance and living one begins to collapse. Marin turns to Daisy's century-old diary for answers, hoping its pages hold some way to understand what happened in 1926, and some way to stop it from happening again. Sager builds this slow-burning dread across two intertwined timelines, letting the past and present edge closer together with every page.
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Key Takeaways:
“History that refuses to stay in the past”: The novel's central tension comes from the unsettling possibility that New Avalon's century-old tragedy is not history at all, but a pattern waiting to repeat itself. Sager uses this recurrence to explore how deeply certain places seem to hold onto what happened within them. “The blurred line between performance and reality”: As Marin and her castmates recreate the vanished women's lives in pursuit of authenticity, the novel raises unsettling questions about what happens when fiction is built too closely on top of real, unresolved trauma. The production's commitment to realism becomes its own kind of danger. “Isolation as its own antagonist”: Stranding the cast on New Avalon, cut off from outside contact and modern comforts, transforms the island itself into a source of mounting dread. Sager uses this enforced isolation to strip away easy explanations, leaving both characters and readers unsure what to trust. “Two timelines, one unresolved question”: By weaving Daisy's century-old diary entries alongside Marin's present-day experience, the novel builds a mirrored structure where past and present continually illuminate and complicate one another. This dual perspective deepens the mystery while letting Sager withhold the truth until it can land with full force.
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Iconic Lines, Scenes & Characters:
Marin Keane. A struggling actress suddenly thrust into an opportunity far stranger than she anticipated, Marin's growing unease as fiction and reality begin to overlap gives the novel its emotional throughline. Her determination to understand Daisy's diary becomes as much personal survival as professional ambition. Daisy Rue's diary. The century-old writings of one of New Avalon's original vanished women serve as the novel's emotional and narrative anchor, offering fragments of truth that only deepen the mystery. Its presence throughout gives the past a haunting immediacy. The dresses in the oak tree. The image of five dresses hanging from a single tree, the only trace left of the vanished women, becomes the novel's most haunting visual motif. It recurs with chilling effect as the present-day disappearances begin to mirror the past. The isolated production. The decision to strand the cast on the island itself, living without electricity or outside contact in pursuit of authenticity, transforms an ambitious creative choice into a genuinely unsettling premise. It is the detail that pushes the story from atmospheric to outright frightening.
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Who Should Read This:
Readers who love slow-burning, atmospheric thrillers with a strong sense of dread will find New Avalon's isolation and folklore genuinely immersive. Sager takes his time building tension, rewarding patient readers with an ending that lands with real force. Anyone drawn to dual-timeline mysteries that mirror past and present will appreciate how deliberately the novel's structure deepens its central question, letting Daisy's diary and Marin's experience inform one another until the connections finally click into place. Fans of gothic, supernatural-tinged horror will enjoy the novel's commitment to unease over easy answers, as isolation, folklore, and unexplained disappearances combine into a genuinely unsettling reading experience. A note for readers: this is a patient, deliberately paced thriller, and some readers may find the earlier chapters slower than the tension-filled final stretch. Those looking for immediate payoff should expect a build that takes its time before delivering its twists.
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IBC Editorial Note:
This review is part of the Indian Book Club’s editorial initiative to spotlight books that inspire, inform, and leave a lasting impact on readers. Every title featured is carefully handpicked and reviewed by the IBC Editorial Team to maintain quality, authenticity, and literary value. If you are an author, publisher, or reader and would like to submit a book for review, we’d be delighted to hear from you. Please write to us at: editorial@indianbookclub.com Our team personally evaluates each submission, and selected books are featured as official IBC Editorial Reviews on our platform.