After an up-and-coming artist is brutally murdered in her apartment, Detectives Odafin Tutuola and Elliot Stabler link her death to another unsolved murder case. As they pursue the case further, they realize that these two murders have striking similarities to a string of murders by a mysterious serial killer that Detective Victor Moranhas been following for months. Moran fights to keep his control over the case as Detectives Fin and Stabler struggle to find the killer.
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.