The Fifth Operational Corps is preparing for the future, but are horrified to see the shape of things to come.

A new form of surveillance is spreading across the South Coast of England. The British people are being shown a new kind of peace, but at what cost? Brigadier Lethbridge-Stewart and his team fear it may already be too late when this revolutionary method of control extends its reach through the ordinary city streets.

There are other secrets at work too, stretching from the past through the hidden world beneath the surface.

With nowhere to hide, Lethbridge-Stewart, Anne Travers, Bill Bishop and Samson Ware must find new allies. With their own histories part of the pattern and the fate of the country at stake, can they resist a force that’s closing in from every direction?