Istanbul, 1838. In his palace on the Bosphorus, Sultan Mahmud II is dying, and the city swirls with rumors and alarms. The unexpected arrival of a French archaeologist determined to track down lost Byzantine treasures throws the Greek community into confusion. Yashim Togalu is once again enlisted to investigate. But when the archaeologist's mutilated body is discovered outside the French embassy, it turns out there is only one suspect: Yashim himself....

When the admiral of the Ottoman fleet defects to the Egyptians, Investigator Yashim attempts to uncover the man's motives. But Fevzi Pasha is no stranger to Yashim: it was Pasha, in fact, who taught the investigator his craft years ago. He is the only man whom Yashim has ever truly feared: ruthless, cruel, and unswervingly loyal to the sultan. What dark secret has led his former mentor to betray the Ottoman Empire?Unraveling Pasha's curious history,...