A dead child - sadistically murdered - his twin missing. A ring procuring children for the rich and powerful. A sinister organisation led by a shadowy figure known only as 'The Stoatmaster' whose cold tentacles seemingly stretch unendingly so that no place and no one is safe - not even the police. A Muslim detective, himself a twin, whose background renders others suspicious of him. His ruthless intelligence and tenacity converge to an obsession with finding the missing child and her brother's killer. His problem - he wants to leave the police. One last case can be a case too far when a...

Rahman Khan cannot leave the police. At least not yet. He has a new team, a new supervising officer and an old obsession - to finish what he had hoped would be his one last case - if it will let him. Driven to find a virtual foe known only as the Stoatmaster - behind the procurement of children for wealthy and powerful paedophiles, he must first solve the riddle of the Purples. The abyss of the dark web looms and hypnotically beckons. Another fugitive they cannot find - this time of flesh and bones - the killer of a colleague, the sadistic terrorizer of children - an enemy who is to them...

Someone is killing children. Inspector Rahman Khan does not know who, where or how many intended victims there are. He knows only that they will die unless he gets to them first. Is something thwarting efforts to find the Stoatmaster or is he just not up to the task? A religious sect called the Farm led by the enigmatic Sister Cade beckons mysteriously. Is pressure to infiltrate a London Mosque suspected of links to trafficked children a lead or a diversion? A whistle blower in the Five Eyes Network leaks information that warns the Stoatmaster how close they are and puts a price in Bitcoins...