Britain at war, fighting for survival, the population doggedly enduring. Then suddenly, a new threat - an internal one. Vital food stocks are destroyed. Possibly the one threat that could panic the population if it were widely known. And it is. Leaflets are scattered over the country describing in detail what has happened.

Department Z is called in and quickly realise from the scale of the destruction that a big organisation and powerful and highly placed men must be involved. Men who coldly set their plans in motion behind a smokescreen of confused trails and strange incidents.