Tripp Pickell

While investigating a serial bomber's attack on a small town, Gideon learns that the perpetrator is a protege of his nemesis, who had murdered his previous team of profilers.

The team searches for a serial killer along the Appalachian Trail in rural Virginia.

Abby risks her career in defense of a dog that authorities believe is behind a fatal mauling; Gibbs tries to ferret out the secret Jenny is keeping.

The CSI team investigates when a body is dug up in the luau pit of a Hawaiian-themed hotel; Internal Affairs begins to question Grissom and Sara's return to the crime lab.

President Taylor’s vision of global peace has been foiled over the last 13 hellish hours, and the situation worsens when the imminent threat of mass destruction clarifies. As her idealistic nature becomes a point of contention, she tasks Jack Bauer with a crucial mission, and advisor Ethan Kanin returns.

Residents of Jericho are outnumbered by residents of New Bern as the battle begins; help arrives from an unexpected source.