Codenamed "Firefly," a 13 year old boy flees a Greek refugee camp with vital intelligence on a vicious ISIS terror cell. But in this series debut, the terrorists are on his trail, trying to prevent him from reaching Germany. When MI6 becomes aware of Firefly, they send former agent Paul Samson—fluent in Arabic and himself the product of an earlier civil war—into the mountains of Macedonia to find Firefly and get him to safety.