Behind one of the greatest tragedies in UK policing history lies an incredible political scandal. On 17 April 1984, as demonstrators gathered outside the Libyan embassy in London, two gunmen lay in wait inside. At 10.18 a.m. automatic gunfire rained down on the protestors and WPC Yvonne Fletcher fell, mortally wounded. As his friend lay dying, PC John Murray made her a promise that he would not rest until those responsible had...