The CSIs find a dead little girl in a box behind a club. They have to trace where the box came from and everyone that handled the box before it ended up there as well as find the identity of the girl. The case is very upsetting for Catherine as she becomes personally involved, while Grissom urges her to remain professional about it. First they are led to a man who has a child molestation background but turns out he had nothing to do with it. They then come to the conclusion that it was the ex con step father only to discover in the end that it was a horrible accident.