The team investigate a mass murder at an internet security company, while Prentiss must complete recertification training under Morgan's supervision.
The Red Cell team travel to Cincinnati to track down a killer who is targeting single businessmen in upscale hotels.
Brennan and Booth's investigation identifies a decomposed body found in a local alley as that of a friendless teen.
After uncovering faulty bulletproof vests in a truck filled with stolen USMC merchandise, the NCIS team attempt to locate both the source and any vests that have been shipped to military personnel overseas.
Olivia receives an anonymous letter containing a coded warning, which could expose Huck's dark past.