At a wholesale fish market at the harbor in Los Angeles, an explosion kills two workers, including the son of the owner (a Korean immigrant); Hetty sends G, Sam, and Deeks to look into the possibility of an involvement with international terrorism. Another worker identifies herself as Talia, an undercover agent of the DEA; she provides information and loses consciousness; the guys help; Deeks and Talia chat at the shed; while riding horses, Kensi and Granger find a crashed chopper; Eric finds a lead, so G and Sam chase it and find an Ecuadorean who speaks no Spanish, who, Eric says, is really Yemeni; Kensi takes a shot but misses; the gang look for trucks for servicing septic tanks, and they find one; after putting together all the pieces, they also learn about a special event aboard a museum battleship, USS Iowa (BB-61), moored in San Pedro, and they go there, where they wind up some business with the bad guys; Deeks expects six more weeks of winter.
—DocRushing