NCIS' outstanding season-ending arc continues next week with "Up in Smoke."

Last night's installment, "Playing With Fire," picked up where the previous week's "Rekindled" left off. Both hours were terrific, with the team hot on an arsonist's trail and desperate to stop a terrorist's next move.

That terrorist now has a name and face: Harper Deering, played by The West Wing's Richard Schiff. He makes his debut next week, while Jamie Lee Curtis reprises her role as Dr. Samantha Ryan.

The stakes are raised again as team tracks down Deering and tries to ascertain what secrets could be in enemy hands after a high-tech bug is found inside a probationary agent Ned Dorneget's tooth.

Watch the promo for "Up in Smoke" below:

Meanwhile, the festivities for Jimmy Palmer’s upcoming wedding continue with the bachelor party, planned by "best man" Abby. What will that entail? Click to enlarge the photos from the episode: