Malcolm Moriarty is a Spanish speaking American living in Arizona; he plays a small part in the local drug trade. Following a confrontation that puts a police officer in hospital with life threatening injuries he uses his contacts to make his way to Mexico. Here he quickly needs to prove his worth; he comes up with an idea to improve the movement of drugs over the border... this impresses some in the cartel but others are less keen on this interloper from north of the border. It isn't long before tensions are rising and even more people start dying. As well as the Cartel he has to worry about US law enforcement determined to bring him to justice for the assault on an officer.
It must be stated that this is fairly light-weight fare; certainly not in the league of 'Narcos: Mexico' or 'Breaking Bad'. That said I found it a fun way to pass the time. There are plenty of clichés; Moriarty, nick-named 'Yankee', gets to high levels in the cartel unrealistically quickly; most law enforcement officers on both sides of the border appear to be corrupt to some degree and Moriarty seems to survive a surprising number of attacks... at least he gets hurt, sometimes seriously. The acting is decent enough, at least to this non Spanish speaking viewer. There is a decent amount of fairly exciting action. Overall I wouldn't call this a must see series but it passes the time well if you enjoy the genre; if a second season is made I'd watch it..
These comments are based on watching the series in Spanish with English subtitles.