Texas mom Heidi Broussard and her newborn baby vanish without a trace after she drops her oldest child at a book fair. Her fiance says all her belongings, aside from her cellphone, were left behind in their Austin apartment. No one has seen or heard from her since.What happened to Heidi?Joining Nancy Grace to discuss the case:Bruce Johnson: Owner of ISP Investigations, Retired Master Sgt Region One Crime Scene Commander, Chicago Metro AreaDr. Debbie Joffe-Ellis: Psychologist, Adjunct Professor at Columbia UniversityKaren Smith: Forensics Expert, Bare Bones Consulting Melanie Barden: KEYE CBS Austin Reporter