Tory Van Dyne is the most down-to-earth member of a decidedly eccentric old-money New York family. For one thing, as book conservator at Manhattan’s Mystery Guild Library, she actually has a job. Plus, she’s left up-town society behind for a quiet life downtown. So she’s not thrilled when she discovers a woman in the library’s Christie Room who calmly introduces herself as Agatha Christie, politely requests a cocktail, and announces she’s there to help solve a murder— that has not yet happened.