Empress Maria Theresa of Austria has sent secret agents Paul Müller
and Franz Braun to Prussia to assassinate King Frederick the Great.
Baron Manfred von Hochenheimer, the unscrupulous and cruel Prussian Minister
of Police, thwarts their first attempt.
Paul and Franz soon learn
that Baron von Hochenheimer will go to any lengths to protect his King.
They conclude that, in order to kill Frederick the Great, they will
have to murder von Hochenheimer first.
Their plans go awry and they are forced to flee Berlin on foot for
Vienna, pursued by Prussian border guards.
Paul and Franz now try to return to Prussia for a final attempt to
kill Frederick the Great, but Prussian foresters, soldiers, and
secret police block their way.
The story reaches a violent climax during a concert conducted by
Johan Sebastian Bach, “Old Bach” of the title.
Web site of Old Bach Is Come