When Marissa Irvine goes to pick up her young son Milo from his first playdate with a boy at his new school, the woman who answers the door has never seen or heard of either Marissa or her son -- beginning every parent's worst nightmare. As Marissa and her husband Peter begin a desperate search for their son, their family starts to come apart at the seams. With new friend Jenny Kaminski, the only person that Marissa can count on, the two women form a close and unlikely alliance. Together they hunt for Milo, uncovering deep family secrets that alter the course of both their lives forever. Charged with finding Milo and bringing the kidnappers to justice, Detective Alcaras unravels the complex and frightening web of deception and lies that has ensnared both the Irvine and Kaminski families, but his moral code is stretched to breaking point.