If You Tell: A True Story of Murder, Family Secrets, and the Unbreakable Bond of Sisterhood, by Gregg Olsen.

A horrifying, true story, If You Tell is the story of the sadistic killer Shelly Knotek living in Raymond, Wash., and the sisters who ultimately stopped her. In 2003, Knotek and her husband, Dave, were arrested and sent to prison for the murder of Kathy Loreno, Ronald Woodworth, and Shane Watson.

People Magazine called this book a "stunner about sibling love, courage, and resilience," and they hit the nail right on the head! Olsen manages to capture the horrors in the Knotek househo...