Steve Blade and maverick police officer DCI Jack Priestly - both successful in their chosen careers, both unorthodox in their methods. Chance dictates that the vastly different worlds of these childhood friends will be drawn together once again. Although the friendship is marked by conflict, Blade and Priestly call upon the trust and loyalty forged during their boyhood when they are assigned to work together. In a daring and supremely hazardous undercover operation, Blade turns mole for the police and their darkly mysterious Secret Squirrels. The partnership exposes not only the extreme violence of the professional criminal underworld, but also the corruption and treachery present at the very highest levels of the British government and police force.