Popular "Me and Mommy" blogger, Jenny Markham, is haunted by the feeling that Milly, the twin daughter she lost at birth, is still alive. Her surviving twin daughter, Lily, feels Milly's 'presence' too, but Jenny's husband, Connor, fears it's becoming an obsession and insists Jenny put her grief aside for Lily's sake. But driven by her faith that Milly is still out there somewhere, afraid and needing her help, Jenny's pursuit of the truth throws her into a deadly game of cat and mouse with ruthless child abductors who will stop at nothing to silence her - and her family.