When Kate Jenkins awakens to the police on her doorstep, her greatest fear as a parent is realized. Her nine-year-old son, Ethan, is missing--vanished from the cabin where he'd been on an overnight class trip. Shocked and distraught, Kat rushes to the campground, but there is still no sign of her son.

Another mother from the school, Stef Huntington, is living a picture-perfect life with money, prominence in the community, a popular son and a loving husband. She hardly knows Kat but has heard the vicious gossip that swirls around Kat's traumatic past. As the police investigation unfolds and her path crosses with Kat's, Ethan's disappearance has earth-shattering consequences for Stef. The two mothers must race against the clock to find Ethan, and with their desperate search comes a terrifying question--who is safe to trust?