Expediente X Temporada 5 Episódio 6

On her Christmas vacation with her brothers family, Scully receives a mysterious phone call from a familiar voice who says, She needs your help. Go to her. The phone call leads Scully to a murder case where the victims 3-year-old adopted daughter bears an uncanny likeness to her sister, Melissa, at that age. The emotional roller coaster that follows has Scully believing that her sister had a baby during a period when she traveled the country and she tries to adopt the child, knowing that caring for the little girl would change her life.