Agent X's fourth episode sees John travelling to Mexico. He is tracking down an undercover DEA agent who has infiltrated a drug cartel led by a man known as El Diablo. El Diablo has ties to the Director of the CIA, who was killed in episode 3 by Speaker of the House Miles Latham. John travels to Mexico to find a ledger containing the names of El Diablo's contacts. The search for the ledger brings John into contact with Luna, a local police chief. Luna is trying to make a difference in the fight against the cartel, but that is not so easy for her to do. Also, it's the Day of the Dead in Mexico, which doesn't make things any easier.
In the meantime, Vice President Natalie looks into the photos that she found of her late husband Steven with another woman. That woman actually turns out to be the fiancé of Miles Latham. Miles and Natalie aren't exactly the best of allies, but still Natalie informs Miles of the photos and suspects an affair between Steven and Miles' fiancé. However, since Miles is behind the cabal trying to take down the President, you can imagine he is probably up to no good.
"The Devil and John Chase" airs Sunday at 9/8c on TNT. Watch a promo for the episode below.
