The Long Way Home - S4.E15

A tormented Rachel must push aside her personal nightmares when she realizes that a disturbed child slayer (guest star Harry Groener, ""Buffy The Vampire Slayer""), whom she could not convict as a prosecutor years before, has resumed kidnapping young girls and putting them in gilded cages where he worships them as virginal ""princesses."" At the same time, Rachel is troubled by the sudden disappearance of her drug-addicted brother (guest star Raphael Sbarge) from a halfway house and her romantic relationship with therapist Tom (guest star Joe Flanigan, NBC's ""Providence"") enters a new stage. Also, George frets about the hot shot computer whiz (guest star Judith Moreland) who's temporarily replaced him while he's on leave due to his own struggle with narcotics.