- MI5 come up against the Chala Cartel, Colombia's biggest drug traffickers, when eight customs and excise officers are murdered. Surveillance reveals a link between the cartel and one of Britain's leading oil companies.
- The Chala Cartel, a Colombian criminal organization dealing with drugs and weapons, are the focus of MI5 this time. Trying to get into the country, Chala Cartel kill 8 members of custom. In order to get to the core of Chala Cartel, Tom and Zoe start liaising with the leader's girlfriend Mariella.—R.
- Tom, still under pressure from Harry Pearce to terminate his relationship with London-based CIA agent Christine Dale, is on assignment with officers from Customs observing the activities of the Chala drugs cartel from Columbia. A brief absence from their surveillance vehicle results in Tom returning to find that everyone has been killed. They find a link between the cartel and prominent oil executive Ross Vaughan in the form of Mariela Hernandez, girlfriend of Rafael Morientes, the cartel's hit man. Zoe and Tom go undercover as brother and sister to befriend Mariela and find out just what the cartel and Vaughan are up to. Meanwhile, Sam has gotten in over her head thinking she's doing a favor for a senior officer.—garykmcd
- A Colombian drugs cartel is implicated in the murder of a team from Customs and Excise. Zoe and Tom are sent undercover to "turn" the girlfriend of the head of the cartel. Tessa, still nursing a grudge against Harry and MI5, reappears, and her interference may jeopardize the operation.
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