Liesl Weiss long ago learned to be content working behind the scenes in the distinguished rare books department of a large university. But when her boss has a stroke and she's left to run things, she discovers that the library's most prized manuscript is missing. Liesl tries to sound the alarm and inform the police about the missing priceless book, but is told repeatedly to keep quiet, to keep the doors open and the donors happy. But then a librarian unexpectedly stops showing up to work. Liesl must investigate both disappearances, unspooling her colleagues' pasts like the threads of a rare book binding as it becomes clear that someone in the department must be responsible for the theft.