Law & Order: Special Victims Unit Season 10 Episode 19 : Selfish

When it is reported by Ruth Walker that her two year-old granddaughter, Sierra Walker, is missing Detectives Olivia Benson and Elliot Stabler investigate. After rounds of interrogation and a failed Amber Alert, Benson and Stabler believe that the prime suspect is none other than Sierra's young and irresponsible mother, Ashlee Walker.