When its librarian keeper mysteriously dies, two former classmates must race to locate a rare book from their college years that can foretell your future if you confess a secret from your past--but someone is intent on protecting what's hidden inside. The Library of Fates was designed to show you who you are--and who you could become. Its rarest book, The Book of Dark Nights, holds a secret: when you write an intimate confession on its pages, you'll receive a prediction for your future, penned in your own handwriting. For Eleanor, whose childhood was defined by a senseless tragedy, the library offers a world where everything makes sense. She's spent most of her life there as an apprentice to the brilliant librarian, showing other people how to find the meaning of their lives in stories. But when her mentor dies in a freak accident and The Book of Dark Nights goes missing--along with the secrets written inside--Eleanor is pulled out of the library and into a quest to locate it with the last person she expects: the librarian's estranged son, Daniel, who Eleanor once loved before he suddenly ran off to Europe decades ago. Together, as they hunt down clues from Harvard to Paris, Eleanor and Daniel grow closer again, regaining each other's trust. But little do they know that they're entangled in a much larger web.

Someone else wants the book, and they may be willing to kill to get it.