DCI Cook faces his Greatest Challenge. The Islamic State is waging war in England, and they are winning.

Not only does Isaac Cook have to contend with finding the perpetrators, but he is being forced to commit to actions contrary to his mandate as a police officer.

And then, there is Anne Argento, the Prime Minister's Deputy. The man has proven himself to be a pacifist and is not up to the task. She needs to take his job if the country is to fight back against the Islamists.

Vane and Martin have provided the solution. Will DCI Cook and Anne Argento be willing to follow through? Are they able to act for the good of England, knowing that a criminal and murderous activity is about to take place? Do they have any option?