Two masked broke into Marines camp Pendleton. Clumsy clown, Bobby Asher, got arrested and is scared to betray and helps 'colleague' Kensi trick the man who recruited him. That's presumed, never convicted master thief Stanley King, who shoots Asher and recruits Kensi for his 'last job'. It turns out he systematically takes new helpers and eliminates them afterward, and seems able to blow Kensi's cover. King's unknown target probably relates to a Chinese spy.