Chapter 1: The Girl at the Edge of the Sea

Southend-on-Sea, Essex, England

14 February 1997

The North Sea wind cut through the seaside town like a blade, rattling the windows of the abandoned arcade on the pier and sending discarded crisp packets skittering across the wet promenade. Evie Robinson stood at the edge of the wooden boardwalk, her thin coat pulled tight around her shoulders, watching the grey waves churn beneath a sky the colour of bruised iron.

She was twelve years old, though she looked younger—small for her age, with dark hair that fell in tangled waves past her shoulders and eyes the colour of winter storms. Her trainers were held together with duct tape, her jeans had holes in both knees, and her stomach had been empty for so long that the hunger had become a dull, familiar ache rather than a sharp pain.

Three weeks. That was how long she had been on her own.

Three weeks since she had come home from school to find her mother’s body slumped against the kitchen wall, blood pooling beneath her like a dark tide, and a man in a black balaclava standing over her with a pistol in his hand. Three weeks since she had run—run faster than she had ever run in her life, through the back garden and over the fence, not stopping until her legs gave out and she collapsed in a field of frozen grass two miles away.

The police had asked her questions. Social services had asked more. But Evie had told them nothing—could tell them nothing, because the man had seen her. He had looked right at her, and in that moment before she fled, she had seen his eyes through the holes in his mask. Cold eyes. Dead eyes. Eyes that would remember her face.

So she had run again, this time from the well-meaning adults who wanted to put her in a children’s home, and she had been running ever since.

The pier was quiet at this hour—too early for tourists, too late for fishermen. Evie liked it here. The sound of the waves helped drown out the memories, and the cold kept her alert. She had learned quickly that being alert was the only thing keeping her alive.

She didn’t hear the footsteps approaching until it was almost too late.

“Evie Robinson?”

The voice was American—deep, calm, with an edge of something that made her think of gravel being poured over ice. She spun around, her heart hammering in her chest, her hands curling into fists at her sides.

The man standing ten feet away was tall and broad-shouldered, with short grey hair cropped close to his skull and a face that looked like it had been carved from weathered stone. He wore a dark wool coat and leather gloves, and his eyes—pale blue, sharp as broken glass—studied her with an intensity that made her feel like a specimen under a microscope.

“Who are you?” Evie demanded, her voice steadier than she felt. “How do you know my name?”

The man didn’t answer immediately. Instead, he reached slowly into his coat pocket—Evie tensed, ready to run—and withdrew a photograph. He held it up for her to see.

It was a picture of her mother. Younger, happier, standing beside a man Evie didn’t recognise. They were both in uniform, both smiling, both holding medals.

“Your mother was CIA,” the man said. “Stationed in London during the Cold War. She was one of the best operatives I ever worked with.”

Evie’s breath caught in her throat. “You’re lying.”

“I don’t lie.” The man’s voice was flat, matter-of-fact. “My name is Maurice Braverman. I was your mother’s handler. And I’m here because I made her a promise—that if anything ever happened to her, I would look after you.”

“I don’t need looking after,” Evie said, her voice sharp. “I’ve been doing fine on my own.”

Maurice’s lips twitched—not quite a smile, but close. “You’ve been surviving. That’s not the same thing.” He took a step closer, and Evie fought the urge to back away. “The men who killed your mother—they’re still out there. They know about you. They know you saw them.”

Evie’s blood ran cold. “How do you know that?”

“Because I’ve been tracking them for six months. They’re IRA—Irish Republican Army. And they’ve been operating on British soil with impunity, targeting intelligence assets and their families.” Maurice’s jaw tightened. “Your mother was one of seven agents killed by this cell. You’re the only witness who survived.”

The wind howled around them, whipping Evie’s hair across her face. She pushed it back with trembling hands, trying to process what she was hearing. Her mother had been a spy. A CIA agent. And she had been murdered by terrorists.

“What do you want from me?” Evie asked.

Maurice studied her for a long moment. “I want to train you.”

“Train me?”

“To fight. To kill. To hunt down the men who murdered your mother and make them pay.” He paused, letting the words sink in. “You have potential, Evie. I saw it the moment I started tracking you. The way you evaded the police, the way you’ve survived on the streets for three weeks without getting caught—that takes instinct. Intelligence. Guts.”

He tilted his head. “I can turn those instincts into skills. I can give you the tools to take your revenge.”

Evie’s mind raced. This was insane. This was impossible. But even as she thought it, she knew she was going to say yes. Because the alternative—a life of running, a life of fear, a life spent looking over her shoulder—was no life at all.

“What about the police?” she asked. “Social services? They’re looking for me.”

“Leave that to me. As far as the world is concerned, Evie Robinson is going to disappear.” Maurice extended his hand. “So what do you say?”

Evie looked at his hand. Then she looked at the sea—grey and endless, stretching out toward the horizon. She thought of her mother, bleeding on the kitchen floor. She thought of the man in the balaclava, his dead eyes staring through the holes in his mask.

She thought of revenge.

“I say yes,” she said, and took his hand.

Margate, Kent, England

15 February 1997

Two hundred miles away, in a run-down bed and breakfast on the Kentish coast, Madeline Bradley was learning how to kill a man with a pencil.

She had been with MI5 for three months now, ever since Nigel Hodgson had found her living in a bus shelter on the promenade, half-dead from exposure and malnutrition. He had offered her food, warmth, and a purpose. In return, she had given him the only thing she had left—her loyalty.

Now she sat cross-legged on the floor of the B&B’s cramped dining room, a wooden pencil clutched in her right hand, while Nigel circled her like a hawk.

“Again,” he said.

Madeline lunged, driving the pencil toward the practice dummy’s throat. Nigel caught her wrist, twisted it, and sent her sprawling to the floor.

“Too slow,” he said. “Too predictable. You telegraph your movements.”

Madeline pushed herself up, ignoring the sting in her shoulder. She was thirteen years old, tall for her age, with strawberry-blonde hair cut short and eyes the colour of green sea glass. There was a scar on her left cheek—a souvenir from her first week of training, when Nigel had thrown a knife at her and she had barely dodged in time.

“Again,” Nigel repeated.

She lunged again. This time, she feinted left, then drove the pencil toward the dummy’s eye. Nigel caught her wrist again, but this time she twisted free, dropped low, and swept his legs out from under him.

He hit the floor with a grunt. Madeline stood over him, pencil raised, chest heaving.

Nigel smiled—a rare sight. “Better.”

Madeline helped him to his feet. At forty-nine, Nigel Hodgson was lean and wiry, with grey-streaked hair and a face that had been hardened by three decades of military service. He had fought in Malaya, in the Falklands, and in half a dozen conflicts that had never officially been acknowledged. Now he worked for MI5, hunting IRA operatives on British soil.

“You’re learning fast,” Nigel said, brushing dust from his trousers. “Faster than I expected.”

“I have a good teacher,” Madeline replied.

Nigel’s smile faded. He walked to the window, staring out at the grey sea. “There’s something I need to tell you.”

Madeline tensed. She had learned to read Nigel’s moods, and right now he looked... troubled.

“What is it?”

“I received a message from London this morning. One of our operatives was killed in Southend-on-Sea three weeks ago. Her name was Sarah Robinson. She had a daughter—a girl about your age.”

Madeline’s stomach clenched. “What happened to her? The daughter?”

“She disappeared. No trace. MI5 has been looking for her, but...” Nigel shook his head. “The men who killed her mother are still active. They’re part of an IRA cell based in Northern Ireland—one of the most dangerous we’ve ever encountered. Their leader is a man named Peadar MacBrady.”

“Why are you telling me this?”

Nigel turned to face her. “Because I’ve been tracking MacBrady for five years. He killed twelve of my colleagues—people I trained, people I trusted. And I’ve finally found a way to get to him.” He paused. “I want you to help me.”

Madeline stared at him. “Me?”

“You’re young. You’re fast. You’re smart. And more importantly, you’re invisible—no one would ever suspect a child of being an MI5 operative.” Nigel’s eyes were hard. “But this isn’t a game, Madeline. If you agree to this, you’ll be putting your life on the line. You’ll be going up against the most dangerous men in Britain. Some of them—maybe most of them—will try to kill you.”

Madeline thought of her parents—her real parents, who had died in a car crash when she was nine. She thought of the years she had spent in foster care, shuffled from home to home, never belonging anywhere. She thought of the bus shelter, and the cold, and the hunger.

Then she thought of Nigel, who had given her a home, a purpose, and a chance to be something more than a victim.

“I’m in,” she said.

Nigel nodded. “Good. Because there’s someone I want you to meet. Another young operative—a girl about your age. Her code name is Serpent.”

“What’s my code name?”

Nigel’s lips curved into a thin smile. “Stallion.”