Anna had never even heard of it until yesterday and she prided herself in knowing everything.

“You asked to see me, sir?”

His codename was Control. Only a handful of people knew his real name, and even fewer his background. He was a plump, toad-like man, dressed with the immaculate good taste of the best class of public schoolboy. A well tailored suit, an inch of creamy white cuff, a regimental tie fastened with a brass pin. His hands were fleshy, his glistening nails bearing the unmistakeable signs of a recent manicure. Anna found that, above everything else, rather distasteful. He was oleaginous and slippery, undoubtedly brilliant but as far removed from trustworthiness as it was possible to be. That, of course, made him ideal for his position. Like the building from which he worked, he was perfect for his purpose. Control commanded Group Fifteen, otherwise known as the Section, Pegasus and the Department. He supervised two hundred civil servants, mostly seconded from MI5, MI6 and the Foreign Office, analysts and spooks that were simply the network that facilitated the work of the twelve men and women who carried out the jobs that Group Fifteen was allocated. When the government found itself with a particularly intractable problem, and every other route had failed — commercial, diplomatic, political — Group Fifteen would occasionally be put out into the field. And, for them, all solutions were in play.

“Thank you for coming to see me, Miss Thackeray,” Control said.

“Not a problem, sir.”

She tried to project a feeling of ease, but she did not find that simple to do. The occasion was not suited to that, for one, and the formality of the place bothered her. She had already made more concessions than she was comfortable with making: she had removed her earrings, scrubbed the black nail varnish from her fingers and borrowed a trouser suit and a shirt. And, of course, there was her hair. She had dyed it red over the weekend and she was damned if she was going to spend the night before this meeting changing it to something more … conservative.

There were limits.

“Everything I tell you this morning is beyond top secret — I’m sure that goes without saying?”

“It does”

“Very good. I’ll be as brief as I can be. Six months ago, one of our most valuable agents went AWOL. Have you read the file?”

“Yes — John Milton.”

“Indeed. It is our belief that Mr. Milton suffered a mental breakdown following an unsuccessful operation in France. The decision had been taken to bring him in for observation and treatment but, as one of our agents approached him for that purpose, he opened fire on him. A member of the public was killed and the agent was badly wounded. We suppressed that from the report for obvious reasons.”

“Yes.”

“Following those events, Milton has dropped off the grid. We tracked him north to Liverpool and our working assumption is that he either found work on a boat or stowed away on one. The trail went cold from there and we have seen neither hide nor hair of him since. That is a state of affairs that we cannot allow to stand. Mr. Milton was our most experienced operative. He has intimate, first-hand knowledge of operations that would cause the government enormous embarrassment if their existence was ever to be disclosed, and that’s not even considering the operational knowledge that would be of great interest to our enemies — and to our friends.”

“You want me to find him.”

“We do. We’ve been working with your department for some time but, so far, with disappointing results. Your predecessor made no headway and so he has been reassigned and you are replacing him. I understand from your supervisor that you’re the best analyst that GCHQ has to offer.”

“No question.”

“You don’t suffer from false modesty, do you?”

“I don’t see the point in it.”

“You might come to wish you had been more circumspect because now I expect you to meet with more success.” He sipped at his cup of tea; Anna found the sight of his pursed, fleshy lips nauseating.

“I have the file. Is there anything else I need to know?”

“You should be under no disillusions, here: John Milton has been trained to be totally invisible. His profession for ten years was to be a ghost. He has operated in some of the most inhospitable, dangerous places you can imagine — if he was not as good at this as he is, he would have been captured and killed years ago. He is not married, he has no children, he has no real friends. No ties, not to anyone or anything. It will not be an easy task to find him, but I must re-emphasise: he must be found. This could be the making of your career or” — he paused and spread his hands — “not. Do I make myself clear?”

The implication was very clear.

Find him, or else.

“You do,” she said.

19

It was early the next day when Anna stooped to position her eye over the iris scanner, the laser combing up and down and left to right before her identity was confirmed and the gate opened to allow her inside. The guard, his SA80 machine-gun slung loose across his shoulder, smiled a greeting as she passed him. An exhibit in the main entrance hall contained treasures from the history of British code-breaking: the Enigma machine was her favourite but she passed it without looking and went through the further two checks before she was properly inside. GCHQ had the feel of a bustling modern airport, with open-plan offices leading off a circular thoroughfare that was known as the Street, offering cafés, a bar, a restaurant and a gym. Anna walked to the store and bought a copy of the Times and a large skinny latte with an extra shot of espresso.

Most of the staff were dressed conservatively; the squares on their morning commute might have mistaken them for workers on their way in to the office. Suits and blouses, all very proper. But they would not have mistaken Anna like that. She wasn’t interested in conformity and, since she was not ambitious and didn’t care whether she impressed anyone or not, she wore whatever made her comfortable. She was wearing a grey Ministry t-shirt, a black skirt, a battered black leather jacket, ripped Converse All-Stars and red tights. She cocked an eyebrow at the attendant working at the x-ray portal; the man, beyond the point of being exasperated with her after the last six months, readied his wand and waved her through. She smiled at him and, when he smiled back, she winked. She had a sensuous mouth, a delicate nose, and well defined cheekbones that would have suited a catwalk model.

She followed the thoroughfare to the junction that, after another five minutes and a flight of stairs, led to the first floor SigInt Ops Centre where she had her desk. It was a busy, open-plan area, staffed by mathematicians, linguists and analysts scouring the internet for intel on terrorism, nuclear proliferation, energy security, military support, serious organised crime and counter-espionage in different regions. Computer engineers and software developers helped make it possible; the Tempora program alone, responsible for fibre-optic interceptors attached to sub-surface internet cabling, siphoned off 10 gigabits of information every second. Twenty-one petabytes a day. The Prism and Boundless Informant programmes added petabytes more. That huge, amorphous mass of data needed to be sorted and arranged. GCHQ’s gaping larders were stuffed full of data to be harvested by their algorithm profiles against a rainy day.

There were hackers, here, too. A small team of them, including Anna.

Most of them had never considered a career in intelligence.

Anna had wanted the job specifically.

They had instructed her to get it.

And, as it turned out, it had been easy.

Thackeray was an anglicised name that she had adopted when she had moved to London. She was born Anna Vasilyevna Dubrovsky in Volgograd in 1990. Her father was a middle-ranking diplomat in the Russian diplomatic service and her mother worked for the party. She was their only child and her prodigious intelligence — obvious from a very early age — was a source of tremendous pride to them. She had been precocious in school, a genius mathematician, quickly outpacing her peers and then her teachers. There was an annual children’s chess competition in the district and she had won it for two straight years; she had been banned from entering for a third time. She had been inculcated in data and analysis almost before she could read. The day she had been given her first computer — a brand new American-built Dell — was the day that the scales had truly fallen from her eyes. She was taught everything there was to know about it and then, once again, she outpaced her teachers. Volgograd was a dreary backwater and the internet spread out like a vast, open vista, a frontier of unlimited possibility where you could do anything and be anyone. She was taught how to live online. It became her second life. She became addicted to hacking forums, the bazaars where information was exchanged, complex techniques developed and audacious hacks lauded. It became difficult to distinguish between her real self and ‘Solo’, as she soon preferred to be called.