In a gripping tale of intrigue and danger, Hannay is summoned to investigate unsettling rumors of an impending uprising in the Muslim world. His journey takes him through treacherous enemy territory to meet his ally Sandy in Constantinople. Together, they must navigate a web of deception and thwart the Germans sinister plans to manipulate religion for their own gain, culminating in the intense battle of Erzurum.

In a gripping tale of intrigue and danger, Hannay is summoned to investigate unsettling rumors of an impending uprising in the Muslim world. His journey takes him through treacherous enemy territory to meet his ally Sandy in Constantinople. Together, they must navigate a web of deception and thwart the Germans sinister plans to manipulate religion for their own gain, culminating in the intense battle of Erzurum.