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On the Syria/Iraq border a young British extremist executes a hostage. A masked figure called the Caliph watches him.
In Nigeria the British High Commissioner is kidnapped. Regiment hero Danny Black leads a team deployed to find him. When they discover prisoners infected with the plague, they realise they have uncovered a plot to unleash bio-terror.
Danny must identify the Caliph and stop the terrorists before the disease threatens those much closer to home.