Firefly

He is Syrian, and he knows too much about an ISIS terror cell : their whereabouts and their horrific crimes. Now he is on the run from them, making his way along Europe's refugee trail — but they are hot on his heels. That is all MI6 knows about Firefly, but it is enough for them to put Paul Samson on the case. Former MI6 agent, now freelance expert at finding missing persons, Samson's job is to find Firefly before his enemies do.
It will take all Samson's ingenuity and cunning to locate one boy among the sea of humanity travelling through the Balkans. But Firefly is highly resourceful and determined to survive, no matter what it takes.