In this sequel to the New York Times bestselling, "pulse-pounding" (Publishers Weekly) A Door in the Dark, Ren's intellect and cunning are stretched to the limit in her quest to take down the system that stole her father's life. Ren Monroe is one step closer to avenging her father's death. Bonding with Theo Brood has allowed her to infiltrate one of the oldest houses in Kathor. But Theo's father is playing his own...