n Los Angeles a driver rams an SUV, causing a wreck, then shoots and kills the second driver, and a third one blows away the first; the first two men were employees of a family-run gun shop in the San Fernando Valley. Special Agent Mike Renko, of the NCIS, seen previously, is an undercover worker of the same gun shop; G, Sam, Kensi, and Deeks visit the shop; fireworks ensue; the team rescue Renko, then an unknown shooter critically injures him. Granger shows up and fills in Hetty, saying that a tip had indicated that the gun-shop operation is dirty. Renko dies after surgery; the stepdaughter tells much; G and Sam find another dead body. The team find clues and evidence, so they head out to make a deal, but it does not go down; Eric provides the location of the bad guy, nearby, and G realizes who is the bad guy behind it all; the fearless foursome meet him and watch while he explodes a car with Special Agent Lauren Hunter inside, then he surrenders. [To be continued.]

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