The series was commissioned by BBC Fiction's controller Jane Tranter as a spin-off of their long-running drama Spooks, offering a "more maverick, younger perspective" that would attract a 16-24-year-old audience. The series follows a group of six new young MI5 recruits who "follow a different rule book". The decision to relate the new project to the original Spooks was controversial, with actor Georgia Moffett saying “it’s slightly misleading in terms of the word Spooks.” and producer Chris Fry
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