1912: Harry Widener, a promising and passionate book collector, boards the Titanic holding tight to a priceless volume he’s just purchased in London. After catastrophe strikes the ship, Harry’s last known words are that he must return to his cabin to retrieve his latest treasure. Neither the young man nor the book are ever seen again. Honoring her son’s memory, Harry’s mother builds the Harry Widener Memorial Library at Harvard to house his extensive book collection and ensure his legacy.

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Decades later, Violet Hutchins, a Harvard sophomore recovering from her own great loss, is working as a page at the Widener Library. When mysterious things begin happening at the library, Violet wonders if Harry Widener’s ghost is trying to communicate with her, seeking Violet to uncover a long-buried secret that the ardent young Harry took with him to the grave.