Sadie Donovan struggles with the legacy of her grandmother, the famous essayist Laura Lyons, especially after she has wrangled her dream job as a curator at the New York Public Library. But the job quickly becomes a nightmare when rare manuscripts, notes and books for the exhibit Sadie has been running begin disappearing from the library's famous Berg Collection. Determined to save both the exhibit and her career, the typically risk-averse Sadie teams up with a private security expert to uncover the culprit. However, things unexpectedly become personal when the investigation leads Sadie to some unwelcome truths about her own family heritage --- truths that shed new light on the biggest tragedy in the library's history.