ISTANBUL, 1593. The final episode and the Ruzgär have inadvertently released an ancient demon. It now lurks within the bowels of the city.

Returning from their previous mission the Ruzgär unit are declared traitors to the Ottoman Empire and banished from the Janissary order. Even the recovery of the Armour of David, so prized by the Sultan is not enough to prevent this.

Desperate and on the run, Will must turn to the sinister Earl of Rothminster as an unlikely protector. Meanwhile Awa and the remaining Ruzgär, are nevertheless called upon by their supporters to protect the very people who have declared them enemies of the empire, as a mysterious force threatens to engulf the capital. All roads lead to Istanbul and all who traverse it, will be plagued by a demon's touch.