Anima persa

In Prague, in the Malà Strana district, Nikolaus wants to conquer wealth and supreme knowledge by completing an alchemical experiment begun centuries earlier by the adventurer Sendivogius: purifying a "dybbuk", a soul lost in the shallows of time. But Nergal, head of Hell's secret police, finds something to object to, and Harlan and Caleb must intervene to get their friend/enemy out of trouble worse than death...