When Jerry - an American NSA agent - joins a team at GCHQ tackling cyber crime, junior analyst Joseph is particularly excited. But Director of Cyber Security Christine is less keen with the shakeup and wants to know the real reason Jerry is over here. Meanwhile, Jerry looks to make his mark by leading a series of team building exercises.

When Joseph accidentally deletes the department personnel files the whole team are forced to redo their aptitude tests. Afraid of having to take a polygraph, Jerry manoeuvres to take over and run the test procedure himself. But when Jerry suspects that Christine may be hiding feelings for him he reluctantly agrees to taking the polygraph providing Joseph can secretly twist the results.