From pub landlady to chief interrogator, Adrian Goldberg profiles Sue Gray, the woman who secretly “runs Britain”, and is leading the investigation into Downing Street parties. We hear about her unconventional background, a mysterious career break involving brushes with the IRA, and her meteoric rise to become Whitehall’s most feared inquisitor. She’s been called “the most powerful person you’ve never heard of”. But, will she be able to withstand the pressure of investigating her own boss, the Prime Minister?