If You Tell

A shocking and empowering true-crime story of three sisters who are forced to make the most difficult decision of their lives: to turn their murderous mother into the police. Determined to survive their mother's house of horrors, If You Tell is a survivor's story of absolute evil—and the freedom and justice that Nikki, Sami, and Tori risked their lives to fight for.

Barbara Marshall is set to write the script based on New York Times bestselling author Gregg Olsen's nonfiction book.