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Movies like Solver (2017)

Luke, a young professional in New York City, learns his grandfather has disappeared under strange circumstances and is presumed dead. When he arrives at his grandfather's remote cabin, he finds a series of clues and puzzles, each more baffling than the last. With the help of a woman from his past and an eccentric sidekick, he must unravel the puzzle before someone else gets to the dark secret it hides.