Daylon's new psychological thriller tells the heart-racing story of a woman's desperate fight to escape her depraved captor and the tenacious search of a brilliant PI to unravel a three-year-old mystery, keeping a secret promise he made long ago . . . Rose Harrington is a strong, independent young woman whose world has been rocked by loss. Three years ago, her sister Margo went missing. Despite an exhaustive search by police and the assistance of Rose's friend and private investigator, Shaughnessy Flynn, Margo has never been found. Three months ago, Rose's beloved mother died. Feeling disconnected, needing to get back on track, Rose plans an off-the-grid vacation to Hawaii. Meanwhile, Private Investigator Shaughnessy Flynn is suffering from a profound loss of his own, that of the tragic death of his six-year-old son. He too is looking to change his life, to get back on track. When Rose disappears in the same way that her sister Margo did, Flynn knows he must solve this mystery. He failed Rose once, he can't fail her again. What happened to Margo? Where is Rose? What secret lies At the Heart of the Missing?