St Petersburg, 1879. A shot rings out in Palace Square. Cossack guards tackle the would-be assassin to the ground. In the mêlée no one notices a striking dark haired young woman in a heavy coat slip away from the scene. Russia is alive with revolutionaries. While Tsar Alexander II remains a virtual prisoner in his own palaces, his ruthless secret police will stop at nothing to unmask those who plot his assassination and the overthrow of the Imperial regime. For Dr Frederick Hadfield, whose medical practice is dependent on the Anglo-Russian gentry, these are dangerous times. Drawn into a desperate cat-and-mouse game of undercover assignations, plot and counter-plot, he risks all in a perilous double life.