From bestselling author Marissa Stapley comes a gripping novel about marriage, loyalty, and the deadly secrets that unravel over the course of a two-week couples’ therapy retreat in Mexico.We all have thirteen secrets. Five stay buried forever, but the rest will be revealed. Miles Markell is missing, and everyone is a suspect. To the guests at The Harmony Resort, Doctors Miles and Grace Markell appear to be a perfect power couple. They run a couples’ therapy retreat in a luxu