Megan Gallagher

Olivia and her team must keep a DC Madam's client list under wraps; Quinn continues to deal with the President's former intern.

The CBI pursues two lines of investigation when a Santa is murdered: Patrick Jane goes undercover in an AA group; and Rigsby and Van Pelt question members of the National Society of Authentic Santas. Meanwhile, following the demise of a person in custody at the CBI, J.J. LaRoche (guest star Pruitt Taylor Vince) is brought in to question the team when it appears to be an inside job. Guest star Gregory Itzen returns as retired former CBI director Vincent Minelli.

Andy and Jack find themselves in disagreement over spending decisions at the station; the firefighters respond to a structure fire at a brand-new bed-and- breakfast; Ryan calls Maya when he finds her brother in some trouble.

20 months after last season's shocking season finale, when Jack Bauer was captured by Chinese government agents and taken battered and bloodied to points unknown, a series of horrific terrorist attacks rocks the nation. President Wayne Palmer, the strong-minded brother of the late President David Palmer, and his team of advisors, including Karen Hayes, Thomas Lennox and CTU colleagues Chloe O'Brian, Curtis Manning and Bill Buchanan, begin an unthinkable, nail-biting day.

The NCIS team investigates the death of a Navy commander whose body suddenly explodes before Jimmy can examine it.