London, 1605. Robert Catesby, a 33-year old Warwickshire gentleman, devises a plot to blow up Parliament and kill the King.

Dramatisation of the Stephen Downing case which involved the conviction and imprisonment in 1974 of a 17-year-old council worker, Stephen Downing, for the murder of a 32 year old legal secretary, Wendy Sewell, in the town of Bakewell in the Peak District in central England. Following a campaign by a local newspaper, his conviction was overturned in 2002, after Downing had served 27 years in prison. The case is thought to be the longest miscarriage of justice in British legal history, and attracted worldwide media attention.