Special Agent Tennant's team, along with NCIS agents Nick Torres and Jessica Knight, learns about plans for an attack on RIMPAC (The Rim of the Pacific Exercises) in Oahu, the world's largest international maritime warfare exercise.

Tennant and the NCIS team suspect foul play when they investigate a fatal car crash involving a Navy officer who turns out to be an imposter. Also, Whistler finds herself in danger when she goes undercover to learn the truth behind the accident.