All her life Ellie Enderlin had been known as Lila's sister. Until one day, without warning, the shape of their family changed forever. Twenty years ago, Lila, a top math student at Stanford, was murdered in a crime that was never solved. In the aftermath of her sister's death, Ellie entrusted her most intimate feelings to a man who turned the story into a bestselling true crime book - a book that both devastated her family and identified one of Lila's professors as the killer. Decades later, two Americans meet in a remote village in Nicaragua. Ellie is now a professional coffee buyer, an inveterate traveler and incapable of trust. Peter is a ruined academic. And their meeting is not by chance. As rain beats down on the steaming rooftops of the village, Peter leaves Ellie with a gift - the notebook that Lila carried everywhere, a piece of evidence not found with her body. Stunned, Ellie will return home to San Francisco to explore the mysteries of Lila's notebook, filled with mathematical equations, and begin a search that has been waiting for her all these years. It will lead her to a hundred-year-old mathematical puzzle, to a lover no one knew Lila had, to the motives and fate of the man who profited from their family's anguish - and to the deepest secrets even sisters keep from each other. As she connects with people whose lives unknowingly swirled around her own, Ellie will confront a series of startling revelations - from the eloquent truths of numbers to confessions of love, pain and loss.
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