In New York Times bestselling author Flynn Berry’s gripping new thriller, an ordinary woman is ordered to spy on a suspected enemy of the state, or become one herself A private nurse. A mysterious patient. A dangerous secret. Every week, Eleanor commutes from her house in the countryside into Washington, D.C. to visit her wealthy, powerful patients. On a warm spring morning, an officer from a shadowy security agency approaches her along the riverbank and orders her to inform on one of them, a foreign service officer named Anna. Eleanor faces an impossible choice: will she destroy another woman’s life, or her own? Anna is suspected of hiding a shocking secret, but she appears warm and trustworthy. Despite all Eleanor is risking, an unlikely friendship starts to form—and when she learns that her assignment is even more sinister than it seemed, their fates become dangerously entwined. Can Eleanor unravel the government’s plans before it’s too late? A masterly new thriller from the New York Times bestselling author of four acclaimed novels including the Reese’s Book Club pick Northern Spy, A Good Man on a Dark Night is both a riveting page-turner and a rich exploration of womanhood, friendship, and love in an era that threatens all three.