The Good Sister

When Casey's mirror twin, Nora, goes missing after a family quarrel, her instincts tell her something is seriously wrong. After hiring private investigator Hank Mercer, they uncover that Nora has been drawn into a dangerous online underworld, leading them to a luxurious but sinister wellness retreat in the Mexican jungle. Determined to rescue her sister, Casey poses as a guest, only to uncover a chilling reality that threatens both their lives in this gripping psychological thriller by Bonnie Traymore.