The son of a agent who died in the field hacks into the MI-5 system in a misguided attempt to out agents to "save them."
MI-5 helps the British health service inherit funds when the Russian Mafia tries to launder billions through the British banking system.
An secret exercise in terrorist response puts the team at odds, but they successfully make it through after a little gunpoint conversation.
The CIA comes to town to run protection for the President's visit and when Tom's ex gets in the way, they scare her a bit. The visit ends with a meeting of bodies between Tom and CIA head of operations Christine.
Tom asks for the assistance of a thief when a new kind of weapon developed by the French becomes the target of the British government.
Tom questions Harry's leadership when a mission to take down a weapons smuggling drug cartel ends with the death of an innocent all because of Harry and Tessa's posturing.
A strikes rack Britain, Tom goes undercover in the Army to make sure that things aren't in trouble there. Zoe takes charge of moving nuclear waste. These seemingly separate assignments collide when a Major decides to threaten London with a very dirty nuclear bomb. Harry tells Tom that he can't continue relations with Christine.
Tom is set up for an assassination by a disgruntled CIA operative and takes the hard way out when he shoots Harry to escape MI-5.