The Golden Rule is simple: treat others as you would want to be treated.

In 1943 Germany, a senior SS officer shatters that rule by sending an innocent half-Jewish couple to a death camp. Four decades later, he is living in Britain under the guise of a political refugee, secretly working as a spymaster for the Stasi. Meanwhile, in Israel, a determined group is hunting down escaped war criminals, delivering their own form of retribution.

As the past collides with the present, local police detective Richard Buxton, joined by Special Branch and Interpol, must untangle a web of treachery and assassination. But their investigation is hindered at every turn by political interference, making their pursuit of justice all the more dangerous.