The Porsche's tires locked up. The car skidded to a halt on the cracked asphalt of an abandoned shipping yard in South Boston.

The smell of old motor oil and rotting seaweed filled the air.

Ashlee stepped out of the car. The wind whipped her hair across her face. She kept her right hand close to the pocket of her leather jacket, her fingers resting near the grip of her Glock.

She walked through the maze of rusted shipping containers. She stopped in front of a faded red one.

She raised her fist and knocked on the corrugated metal. Two fast knocks, a pause, then one heavy strike.

A heavy deadbolt clacked loudly from the inside. The metal door swung open.

Zane Carrick stood in the doorway. He wore a dark hoodie. He stepped back to let her in.

The inside of the container was a stark contrast to the outside. It was a state-of-the-art mobile command center. Server racks hummed loudly against the walls. Four large monitors glowed with lines of code.

Ashlee walked in. She pulled up a metal folding chair and sat down.

"Give me the DNA results," Ashlee demanded.

Zane picked up an encrypted tablet. He handed it to her. The screen displayed a complex double-helix graphic.

"I ran the blood sample from the clinic through the Grey Iron Delta global mercenary database," Zane said. His face was grim. "Zero matches."

Ashlee frowned. She swiped her finger across the screen. She accessed the Interpol red notice database and the FBI's biometric servers.

The data scrolled furiously. Ten seconds later, a large red box appeared on the screen: NO MATCH.

Ashlee stared at the red letters. Her jaw tightened.

She stood up. She walked over to a white dry-erase board mounted on the wall. She grabbed a black marker and drew a large question mark in the center.

"He breached Area 21," Ashlee said, her voice cold and analytical. "He bypassed our thermal grids. He took a hit from a .50 caliber hollow-point and still managed to cross the ocean. Someone with that level of skill does not exist in a vacuum. He should be in the databases."

"Unless," Zane said slowly, "his identity was completely scrubbed by a state-level intelligence apparatus. A total digital wipe."

Ashlee turned around. "A Ghost Agent."

Zane nodded. "If he's a Ghost, we won't find him by looking for his name or his face. He doesn't exist."

Ashlee felt a rush of adrenaline hit her bloodstream. A tight, dangerous smile touched the corners of her mouth. She loved hunting ghosts.

"Change the parameters," Ashlee ordered. She tossed the marker onto the desk. "Stop looking for the man. Look for the cage."

Zane sat down at his keyboard. "What do you mean?"

"He's severely injured. He needs a secure location to recover. He won't use a hotel. He'll use a safe house," Ashlee said. "Hack the Department of Defense's external property management systems. Look for shell company real estate in the Boston area."

Zane's fingers flew across the keyboard. Lines of code reflected in his glasses.

A map of Boston appeared on the main monitor. Dozens of red dots popped up across the city.

"I have forty-two properties flagged as potential government safe houses," Zane said.

Ashlee walked up to the monitor. She analyzed the map.

"He took a massive hit to the back," Ashlee said. "His mobility is compromised. Eliminate any property that requires climbing more than one flight of stairs."

Zane typed. Fifteen dots vanished.

"He needs to move unseen. Eliminate any property without an attached, enclosed garage," Ashlee commanded.

Zane typed again. Twelve more dots disappeared.

"He bought surgical supplies, but if the wound gets infected, he needs emergency trauma care fast. Eliminate any property further than a ten-minute drive from a major hospital."

Zane hit the enter key. The map zoomed in.

Only three red dots remained.

Ashlee pulled out her phone. She snapped a picture of the three addresses.

"He is in one of these three houses," Ashlee said. Her voice was absolute.

Zane looked up at her. He looked worried. "Mamba, if he is a DIA Ghost Agent, hitting his safe house on US soil is an act of war. You will trigger a diplomatic nightmare."

Ashlee looked down at Zane. Her eyes were completely dead.

"In my world, Zane, there is no diplomacy. There is only alive, and there is dead."

Her phone vibrated in her pocket.

She pulled it out. It was a text message from Averi.

Dad wants you home by 7 PM. We are having a special welcome home dinner for you! Can't wait to celebrate as a family!

Ashlee stared at the pink heart emoji. Her stomach churned with disgust. She knew exactly what this was. It was a trap.

She typed two letters: OK.

She put the phone back in her pocket.

"I have to go," Ashlee said. "I need to clean up some trash in my backyard before I go hunting. Is the secondary location ready?"

"Yes," Zane said, pulling up another encrypted file. "Your cover dorm at Boston Federal University is fully prepped and secure. We bypassed the standard housing lottery. No cameras in the blind spots, and the reinforced locks are installed."

Ashlee nodded. She walked out of the container. The heavy metal door slammed shut behind her. She got back into the Porsche. The engine roared, drowning out the sound of the ocean waves. She drove back toward the Maddox estate.

The heavy blackout curtains in the South Boston townhouse were drawn tight. Not a single ray of sunlight entered the room.

Charles Dunn lay face down on a narrow medical cot.

His eyes snapped open.

A sharp, tearing agony ripped through the right side of his back. It felt like a hot iron rod was buried in his muscles. His pupils dilated. He sucked in a harsh breath through his teeth.

He tried to push himself up with his left arm. The muscles in his back screamed. A low groan escaped his throat.

Leo Vance ran into the room from the hallway. He held a syringe filled with clear liquid.

"Don't move, boss," Leo ordered. He grabbed Charles's shoulder and pressed him firmly back onto the cot. "The surgical glue is barely holding. If you tear those stitches, you'll bleed out."

Leo plunged the needle into the IV line connected to Charles's arm. He pushed the heavy dose of morphine into the vein.

Charles clenched his jaw. He bit down hard on his back teeth. He tasted copper in his mouth. Cold sweat dripped down his forehead and soaked the white bandages wrapped around his chest.

He waited for the drugs to dull the fire in his back.

"The file," Charles rasped. His voice was rough, like sandpaper. "Where is 531?"

Leo pointed to the corner of the room. A heavy, black Pelican blast-proof case sat on the floor. A thick steel cable locked it to the radiator pipe.

"It's secure," Leo said. "We transferred the data to the offline drive. The physical drive is locked in the case."

Charles let out a slow breath. The tension in his neck eased slightly.

He turned his head to look at Leo. His eyes were sharp and completely focused, despite the pain.

"Show me what you pulled out of my back," Charles demanded.

Leo hesitated. He walked over to the metal surgical tray. He picked up a pair of tweezers. He grabbed a small, clear evidence bag and brought it over to the bed.

He held the bag under the harsh light of the desk lamp.

Inside the plastic was a jagged, bloody piece of metal. It was shaped like a twisted flower with sharp petals.

Charles stared at the metal. His stomach tightened. The drug fog in his brain burned away instantly.

He recognized the expansion pattern. He knew exactly what kind of weapon fired that round.

"A custom .50 caliber hollow-point," Charles whispered. He closed his eyes. He remembered the storm. He remembered the wind howling on the cliff. He remembered the impossible distance from the watchtower.

No normal sniper could make that shot in a hurricane.

Charles opened his eyes. A cold dread settled in his chest.

"Black Mamba," Charles said.

Leo sucked in a sharp breath. His face lost its color. "The head instructor of Area 21? Are you sure?"

"Only she uses that specific ammunition," Charles said. He forced himself to sit up. The pain flared, but he ignored it. "And only she could make that shot."

Leo stepped back. His hand instinctively dropped to the holster on his hip. He looked toward the heavily curtained window. "He took a hit from that round and still managed to escape, cross the ocean, and walk into a clinic... he is not a normal target. He must have been wearing some kind of experimental kinetic-displacement armor or injected with high-grade combat stims, otherwise he'd be a puddle of meat." Leo recalled the brief intelligence report they had on her lethality.

"If Black Mamba pulled the trigger, she knows she didn't kill me," Charles said. His brain worked furiously, calculating the tactical variables. "She doesn't let prey escape. She will track the bullet. She will track the blood. She is already in Boston."

"I'll secure the perimeter," Leo said, his voice tight with panic.

"Calm down," Charles ordered harshly. "She won't kick the front door down. She's a tactician. She'll find us, isolate us, and kill us before we even see her."

Charles swung his legs off the cot. His bare feet hit the cold hardwood floor.

"Cut the external network," Charles commanded. "Sever the fiber optic line. Keep the internal security cameras on a closed physical loop. I don't want her hacking our feeds."

Leo nodded and ran to the server rack in the corner. He pulled a heavy cable out of the wall.

"Set up the infrared tripwires in the hallway and the garage," Charles continued. "Rig the front door with a flashbang."

Charles reached under the thin pillow on the cot. His hand wrapped around the grip of his SIG Sauer P320. He pulled the gun out. He checked the chamber. A round was loaded.

He held the cold metal against his leg.

"I just intercepted a burst transmission on the encrypted band," Leo called out from the computer. "It bounced off a cell tower near the seaport. Someone is running a heavy data search in our grid."

Charles's eyes narrowed. "She's narrowing down the safe houses."

He stood up. The room spun for a second. He locked his knees to stay upright.

"Prepare Plan B," Charles said. He walked over to the chair where his clothes lay. "If she breaches the house, you take the case and run. I will hold her off."

"Boss, you can barely stand," Leo protested.

"That file contains the truth about the 531 explosion," Charles said. His voice was filled with a dark, heavy grief. "It contains the names of the people who murdered my family. I will not let her take it back."

Charles picked up his heavy Kevlar vest. He lifted it over his head. The weight of the armor pressed down on his fresh wounds. A fresh wave of agony hit him. He bit his lip until it bled.

He fastened the Velcro straps tight across his chest.

He racked the slide of his SIG Sauer. He stared at the locked door. The ghost was ready for the hunter.