The X Files - Season 5 Episode 6

On her Christmas vacation with her brother\’s 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 victim\’s 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.