Amateur investigator Sierra Barter confronts a traumatic past and secrets that have plagued her family for generations. Sierra, her mother Shannon, and her grandmother Judy bravely pursue the truth about a mystery that could change their lives forever – was Jim Mordecai, their husband, stepfather, and step-grandfather a notorious serial killer? Investigation Discovery presents an Imagine Documentaries and Freak Magnet Production THE TRUTH ABOUT JIM. Directed by Skye Borgman; produced by Dani Sloane; executive produced by Brian Grazer, Ron Howard, Sara Bernstein, Justin Wilkes, Jonathan Goldman, Brent Henderson, Skye Borgman, and Meredith Kaulfers.