The CSI team investigates a case that is personal for Folsom, so they find themselves racing to arrest the suspect before he does.
Tropes:
- Cliffhanger: The season finale ends with Josh being arrested for seemingly murdering his mother's killer.
- The Unreveal: Both Allie and Beau notice that Penny is wearing an engagement ring. When Allie asks about it, Penny interrupts her, directing her attention back to the evidence at hand. When Beau asks, all she reveals is that "you've met him."
- Wham Episode: Josh's mother Jeannette is murdered. The season finale ends with Josh being arrested for seemingly killing his mother's murderer.
