A deeply psychological thriller filled with suspense from Greer Hendricks and Sarah Pekkanen, the bestselling authors of <i>The Wife Between Us</i> and <i>An Anonymous Girl</i>.
Jessica Farris agrees to be a test subject in a psychological study about ethics and morality. But as the study moves from the exam room to the real world, the line between what is real and what is one of Dr. Shieldss experiments blurs. Jessicas behavior will not only be monitored, but manipulated. Jessica quickly learns that some obsessions can be deadly.