Mike Devon finds himself in the middle of the terrorist organisation responsible for the Paris atrocities. Using the refugee crisis as a cover for their activities, these highly-funded extremists are intent on bringing death and destruction to other cities across Europe. When Devon infiltrates one particular gang, operating in the nightclubs of Budapest, he soon realises they are little more than a pawn in a grand game. Someone is using the gang for a far more sinister purpose than the drugs and people-trafficking operations with which they are usually associated. As Devon edges closer to the man at the top of the ladder, he can't afford any mistakes. Because now he's in a race against time to prevent the streets of London becoming the next battleground.