Tim Powers 
Drawing Of The Dark 

When Brian Duffy, an ageing soldier of fortune, is recruited in Venice by a strange old man to work as a bouncer in Vienna at an inn where the fabulous Herzwesten beer is brewed, everything seems straightforward. But his journey is far from it. Pursued and attacked from all sides, guarded and guided by creatures of myth, Duffy is no sooner in Vienna than the city is besieged by the turkish armies of Suleiman. And it becomes apparent that Duffy’s presence is no accident and that it is up to him to preserve the West until the drawing of the dark …