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The government's dangerous penchant for favoring corporate interests is put to the ultimate test after an ambitious politician's research assistant perishes under mysterious circumstances, and a crime that at first appeared unconnected with the death is exposed to reveal an intricate web of lies and deceit. Stephen Collins (David Morrissey) is a rising politician with everything to lose, and his ex-campaign manager Cal McAffery (John Simm) has recently risen to fame as a respected investigative journalist. One day, on her way to work, Stephen's assistant falls to her death in the London Underground. Later, just as it's revealed that Stephen and his assistant were having an affair at the time of her death, the body of a suspected teenage drug dealer is discovered. At first it appears that these two events are completely unrelated, but a closer look reveals some deeply disturbing information about political and corporate interests becoming hopelessly intertwined. Now, as the lies, manipulations, and deceptions gradually boil to the surface, lives will be lost and friendships put to the ultimate test. Bill Nighy, James McAvoy, and Polly Walker star in the award-winning BBC series that riveted television viewers all across the U.K.