In Long Beach, California, in the LA area, a limousine chauffeur spots the body of a man wearing a dress-blue uniform of a Naval officer, hanging from a highway overpass, in what appears to be a suicide; the victim was Calvin Lee, a submariner, nuclear physicist, lieutenant commander, and the XO of a fast-attack boat; he was also a Chinese-American; Callen and company investigate. While Kensi and Nate check out Calvin's pad, so does one of his fellow officers; he runs; Kensi catches him. G and Sam speak with Calvin's sister, who tells them about his fiancée, then they find the body of his boyfriend, with his throat slit. Eric finds a connection with a Chinese gang, so G and Sam pursue it; when they check out a site in Chinatown, they encounter a gangbang. The team figure out the puzzle, and they find the pieces, put them together, and grab the last of the people responsible. This time Eric gains practical experience in the field.