Tom Harrison is the Tick Tock Man. He has the most dangerous job in Britain: defusing terrorist bombs. A job that demands nerves of steel and courage to match. But his skill is being tested to the limit by a new IRA bombing campaign.
It's different from the others, each device more deadly and cunning than the last, each more difficult for him to neutralise. It's almost as if someone is testing him, trying to find his limits - a long-dead adversary reaching out to him from beyond the grave.
Time and luck are running out. From Belfast to London, Harrison is pitched into a very personal battle - a battle where just one mistake will be his last.