During a sorority party, a Navy SEAL - Petty Officer T.J. Blake - is found dead in one of the bedrooms.
The list of possible suspects grows - especially after Pride finds a secret exit in the house, which leads to a series of tunnels. In exploring the tunnel, they discover that it opens up in the centre of town.
The NCIS team is alerted to the fact that Blake had been in a fight about six hours before his death. They discover that his fight had been with a mercenary named Max Wolf.
Brody and LaSalle go to the mercenary bar and when they try to talk with Wolf he bolts and tries to get away. Brody takes after him and after a scuffle she takes him down.
They interview Wolf back at NCIS, who tells that that he fought Blake because Wolf had called Blake's girlfriend - Natalie Lane - a whore. It turns out that the girl who was found in the room with Blake's dead body had been a prostitute he'd been seeing for a while. She had told them that she'd been doing work on the side as a tutor, to support her schooling.
It turns out that there's a prostitution ring hiding under the cover of a tutoring business.
The team can't track Natalie down to ask more questions, so they set up a "tutoring appointment" with her at a hotel. When she gets out of the cab, a car attempts to run her down. Pride sees it in time and tackles her out of the way.
She tells him that T.J. wasn't one of her customers - that they'd had a romantic relationship. She said that Blake had talked her out of continuing with the prostitution business, and that the people she'd been working for had killed him.
As it turns out, it was one of her customers who was unhappy that she was no longer working, so the business owner had ensured that Blake was shot to death for trying to help her.
Dr. Wade and Lund discover some residue of an orange drink in Blake's bullet wound - a result of a contrived homemade silencing device for the gun used to murder him. The team realizes there's one person who habitually uses the orange drink all the time - a security guard at the sorority house.
When they go to arrest him, he attempts to flee through the secret tunnel beneath the house. Brody and LaSalle take off after him down the tunnel. When the security guard comes up out of the tunnel, Pride is waiting for him with a pointed gun.
There is still the matter of who gave the order to kill Blake though.
Natalie rushes back into her dorm room, panicking over the arrest of the security officer, and telling her roommate (who is also working as a prostitute) that they have to get away before the prostitution ring owner gets to them. The girl - Tilda - instead grabs Natalie, demanding to know what she told NCIS.
Natalie accuses her of being the master of the ring, and of ordering Blake's death. Tilda says she had to, because one of her best customers wasn't happy. Then she demands to know that Natalie said nothing. Natalie tells her that she didn't say anything, but that Tilda did - and then she reveals that she's been wired the whole time.
The team bursts in and arrests Tilda.
Pride's daughter visits the office while the team investigates when a NAVY Seal turns dies at a sorority house.