Summary of Riley Sager's The Unknown

Get the Summary of Riley Sager's The Unknown in 20 minutes. In 1926, five women mysteriously vanished from Vermont's New Avalon island. Fifty years later, history appears to be repeating itself. In The Unknown (2026), a thriller by bestselling novelist Riley Sager, a film company descends upon the isolated island to make a movie about the disappearances. The five women, all spiritualists, left behind only their dresses, hanging from an ancient oak tree, and an enigmatic diary. Marin Keane, a struggling actress, and her castmates soon encounter unsettling noises and strange events. They expect to stay only five days, but they're stranded temporarily by an emergency. As new disappearances begin, Marin turns to the diary for clues. Is a human responsible-or a supernatural entity? Who will be next? The clues do more than unravel the past; they also lead to the deepest secrets of the cast and crew.