On the night of 10 February 1567 an explosion devastated the Edinburgh residence of Henry Stewart, Lord Darnley, second husband of Mary, Queen of Scots. The noise was heard as far away as Holyrood Palace, where Queen Mary was attending a wedding masque. Those arriving at the scene of devastation found, in the garden, the naked corpses of Darnley and his valet. Neither had died in the explosion, but both bodies bore marks of strangulation. Alison Weir's investigation of Darnley's murder is set against one of the most dramatic periods in British history. Her conclusions shed a brilliant new light on the actions and motives of the conspirators and, in particular, the extent of Mary's own involvement.