When a suicide bomber targets a memorial service in Glasgow on Remembrance Sunday the nation responds to the bloody carnage left in its wake. DI John Arbogast pursues a small group led by a disaffected military veteran who is hellbent on bringing about political change through brute force.

Set against increasing support for nationalism the newly formed Police Scotland must work with Government to hunt down the suspects and bring the culprits to justice. But faced with growing public unease, and intense political pressure, can the terrorists be stopped?