No Mercy, Paperback/Mike Grist

They came for his kids. There can be no mercy. Black-ops legend Chris Wren has hunted the Blue Fairy for months - a hacker group stalking innocents on the dark Internet. Including his kids. Now an anti-Blue Fairy activist is dead in Detroit, two more have been abducted, and Wren alone knows what it means. The monsters are crawling out into the light. As a Blue Fairy army rises and a mass hacking attack threatens to cripple the USA, only Wren and his brilliant lieutenant Sally Rogers stand ready to enforce true justice: No mercy for the wicked.