NYT bestselling author Michelle Richmond is a bit of a chimera: her novels certainly have mainstream, commercial appeal but there's often a dark core to them, along with influences that include Italo Calvino and Paul Auster. This gives them a lot more depth than the breezy covers might suggest. Her latest, No One You Know, is as much Borgesian mystery as it is the story of a complex relationship between a woman and her sibling. Twenty years after the murder of Ellie Enderlin's sister, Lila, Ellie acquires a strange book of mathematical equations that might hold the key to finding out who killed Lila. What follows is a fascinating exploration of the past, of family secrets, and of a centuries-old mathematical puzzle.