Firefly by Henry Porter

A young Syrian refugee with a photographic memory carries critical intelligence about a looming terrorist network as he flees along the refugee trail into Europe. A former intelligence operative races to find and protect him before jihadist assassins and rival services close in, turning the trek through camps, safe houses, and borders into a high-stakes pursuit that blends espionage tradecraft with a stark portrait of the migrant crisis and its human cost.

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