As he searches for the truth behind the Heathrow bomb that killed his ex-wife, psychologist David Markham infiltrates a shadowy protest group based in the comfortable Chelsea Marina.Led by a charismatic doctor, it aims to rouse the docile middle classes and to free them from the burdens of civic responsibility. Soon Markham is swept up in a campaign that spirals out of control – as the cornerstones of middle England become targets and growing panic grips the capital.