If You Tell is a chilling true-crime narrative by Gregg Olsen that uncovers the disturbing story of the Knotek family. It details the horrific manipulation and abuse Shelly Knotek inflicted upon her three daughters, Nikki, Sami, and Tori. The sisters endured a childhood filled with fear and control, a secret they carried for years. As their mother's dark web escalated, culminating in multiple murders, the sisters found the courage to escape the nightmare. This book chronicles their journey to survival and the unbreakable bond they share after escaping their mother's cruelty.