Tylee Ryan, 17, and her 7-year-old brother, Joshua “JJ” Vallow, who has special needs, vanished in late September 2019. Lori Vallow, the mother of the missing children, was arrested in Kaua’i, Hawaii, on February 20, 2020, after failing to comply with a court order in Idaho’s Madison County, requiring her to physically produce the children no later than January 30. Vallow, who has been extradited to Idaho, refuses to tell anyone where her children are.

What happened to Tylee and JJ, and what do Lori and her new husband, Chad Daybell, know about their disappearance? Dr. Phil poses these questions and more when part one of his podcast, A Mother’s Secret: The Lori Vallow Story Mystery and Murder: Analysis by Dr. Phil drops on Thursday. Listen and subscribe here.