This is one of the best episodes ever written for the show. After everything Nick experienced, his reaction to hoping the little girl can be found alive showed a believable reaction to his own survival after Grave Danger.
When Nick and Sara talk over a picnic table, and she tried to gently let him know that it's probable the little girl is as dead as the rest of the family, Nick takes exception. It's a poignant moment when he talks about his own survival.
The most chilling part of the entire show is hearing the tale told through the raspy voice of a little girl. It brings an eerie quality to the episode that culminates in Nick's visit to her in the hospital.
The episode was utterly amazing.