In Los Angeles a disguised gunman executes a taxicab driver; two hours before dying, the cabby, Joey, a former Navy systems technician and petty officer third-class, sent an e-mail note to Jason, an alias of G in an old case; three weeks ago Joey became released from a prison term for his participation in an embezzlement of Navy money; G goes back undercover as Jason Tedrow. Kensi goes to a Navy brig and visits Perez, the ringleader, who's still behind bars; Perez appears uncooperative. While Jason talks with Jon, the remaining man involved in the embezzlement, a drive-by masked gunman executes Jon. Jon's sister has a boyfriend, Tommy, who has done time for armed robbery, and who dropped into her life as soon as Jon and the others went behind bars; Jason chats with Tommy. Kensi chats up Perez again, and he dies; Eric finds a coincidence, and he pursues it. The team find the pieces and the bad guy, and Jason rides off into the sunset.