1915. German guns are on their way to Ireland. The British government faces its worst nightmare: insurrection at home while it struggles with bloody stalemate on the Western Front. A British spy, Sebastian Wolff of the new Secret Service Bureau, is given the task of hunting down its enemies: one a traitor reviled by the society that honoured him as a national hero; the other a German American doctor who, instead of healing the sick, is developing a terrifying new weapon that he will use in the country of his birth.
Wolff’s mission will take him undercover into the corridors of power in Berlin — where he must win the confidence of the German spymaster who controls both men — then across the Atlantic in a race against time to prevent the destruction of the ships and supplies...