On the latest "NCIS," the team investigated an explosion at a military charity concert.

In "Rock and a Hard Place," a bomb detonates before a charity concert in a former rock star's dressing room, killing an officer and a janitor. The team tracks down the rockstar, Manheim Gold, and takes him into protective custody.

Tony (Michael Weatherly) has to put Manheim up in his apartment. Manheim goes to a gig at a bar, and Tony goes with him to make sure he's protected.

But once they're at the gig, Manheim gets stage fright while Tony picks out a guy in the crowd who had been dropping the same suit off at Manheim's business for weeks without wearing it. Tony tackles him to the ground, but finds out that he's Manheim's son, Denny.

Denny tracked down his rocker father through Ronnie Mustard, the man whom Manheim helped fake his own death to avoid paying up to a loan shark.

It later turns out that Manheim had changed dressing rooms for the charity concert two days ago. Since the bomb was placed a week ago, it looks like he's not the intended target.

It's discovered that the fingerprints on the bomb match Luke's, the event coordinator. But Luke didn't intend to kill anyone.

Luke wanted to get money back that he hid while working as a contractor for a private military company. He had hidden the money in the same complex that the show was moved to after the bombing.

The team captures Luke when they find him and his men drilling money out of concrete.

Meanwhile, in a heartbreaking scene, Palmer (Brian Dietzen) tells Abby (Pauley Perrette) that the birth mother of his future child decided to keep the baby.

On the next episode, "Crescent City," "A Congressman, who was a former NCIS agent, is murdered in New Orleans. Gibbs joins the case with a former colleague in the Crescent City field office and the FBI to determine whether the murder was politically motivated or linked to the victim's arrest of a serial killer who targeted military personnel and public servants."

Vance (Rocky Carroll) will also reappear in the upcoming episode, which is the first half of a two-part backdoor pilot for "NCIS: New Orleans."

Watch the promo for "Crescent City" below, which airs Tuesday, March 25 at 8 p.m. EST on CBS.