"Rick Mofina has penned a creepy, heart-pounding page-turner…. A gripping, chilling thriller from beginning to end." —Heather Gudenkauf, New York Times bestselling author of The Overnight GuestEvery mother worries about their child. But Sara Harmon fears hers…When a teen falls while taking a selfie at the edge of a cliff, the last thing she sees before plummeting to her death is Katie Harmon, the nine-year-old girl she was babysitting, looking down at her.Investigators gather