My passenger had less than a minute to breathe, three intimidating men were watching my every move, and no one at 37,000 feet seemed to understand what was happening. Then the stranger grabbed his throat, looked straight at me, and I realized something terrifying: if I didn't act immediately, the man in seat 2A might die in front of me.

The air in the subterranean tunnel smelled of ancient river mud, rusted iron, and stale salt.

We had been walking in near-total darkness for thirty minutes, guided only by the narrow beam of Marcus’s flashlight. The tunnel was narrow, its arched brick ceiling barely six feet high, dripping cold water onto our heads as we trudged along a abandoned narrow-gauge railway track.

My feet were numb. I had lost one of my high-heeled shoes during the climb out of the elevator shaft, so I had kicked off the other, walking through the wet mud in torn nylon stockings. Every step was agony, but the sheer adrenaline keeping my heart pumping drowned out the physical pain.

"Where are we going?" I asked, my voice echoing hollowly down the damp brick tube.

"An old maintenance station under the Magnificent Mile," Marcus said, keeping a steady pace ahead of us. "It was abandoned by the city transit authority in the seventies. Bennett Holdings bought the lease through a shell company six years ago. It’s off the grid. No digital signatures, no cell signal, no cameras."

"Is Anthony there?"

Marcus paused briefly, swinging the light back toward me to make sure I wasn't falling behind. "No. Moving Anthony out of Northwestern Memorial right now would be suicide. Richard has eyes on every hospital exit in the city. Anthony is safer in an ICU surrounded by federal marshals than anywhere else."

"Federal marshals?" I scoffed bitterly. "You told me the police at the airport were on Richard's payroll!"

"The local transit cops, yes," Marcus corrected softly. "Not the FBI. Anthony made a call to the Special Agent in Charge of the Chicago Field Office thirty minutes after he woke up. The FBI is currently securing his hospital floor under a John Doe warrant. Richard can't touch him there without starting a war with the Department of Justice."

"Then why aren't we at the FBI building?" I demanded, stopping in my tracks. "If the Feds are protecting him, why am I hiding in a sewer like a criminal?"

Marcus turned around completely, his flashlight illuminating my face. His expression was grim.

"Because you aren't just a witness, Evelyn. You're the evidence."

"What does that mean?"

Leo stepped forward, opening his laptop bag and pulling out a small, rugged external drive. "It means Dr. Vance didn't just poison the ampoules, Ms. Carter. He programmed the medical kit’s digital lock to log who opened it and when. The metadata in that case was modified to make it look like you were the one who substituted the medication during the pre-flight checks."

My stomach dropped into a cold, bottomless pit. "What?!"

"They framed you," Leo said gently. "Before the plane even left New York, Richard set up a trail of digital breadcrumbs. If Anthony had died, the toxicology report would have shown potassium chloride. The police would have checked the case's digital log, found your employee access code attached to the opening sequence, and found a offshore bank account created in your name with a two-hundred-thousand-dollar deposit."

I stumbled back against the wet brick wall, my head spinning. "No... no, that's impossible. I don't have an offshore account! I'm a flight attendant! I live in a two-bedroom apartment in Queens!"

"We know that," Marcus said, his voice unusually gentle. "And Anthony knows that. But the media wouldn't care. The police wouldn't care. To the world, you would be the greedy, corrupt crew member who took a bribe from a rival corporation to assassinate a billionaire at 37,000 feet."

Tears of rage and terror finally spilled over my eyelashes, cutting clean tracks through the dust on my cheeks. "Why me? Why did it have to be me?"

"Because you were working row two," Marcus said simply. "It was pure bad luck, Evelyn. You happened to be the person on duty when Richard decided to execute his plan."

He walked back to me, taking off his heavy wool trench coat and draping it over my wet, shivering shoulders.

"But you changed the script," Marcus continued, looking down into my eyes. "You didn't panic. You didn't just use his case. You used the airline's kit, you brought in an independent doctor, and you kept him alive. You broke their timeline. Now Richard is desperate because every minute Anthony is alive, his control over Bennett Holdings slipping."

He turned and pushed open a heavy iron door at the end of the tunnel.

Inside was a small, dry room lit by several battery-powered LED lanterns. It was furnished with two folding cots, a steel table covered in computer monitors, a first-aid kit, and crates of bottled water and military rations. A hidden safehouse buried deep beneath the bustling streets of Chicago.

"Welcome to the bunker," Leo muttered, dropping his bags on the steel table.

I walked inside, sinking onto the edge of one of the cots. The warmth of the heavy coat wrapped around me slowly pulled the chill from my bones, but my mind was spinning out of control.

"What happens now?" I asked, staring at the concrete floor.

"Now, we force Richard to reveal his hand," Marcus said, closing and locking the heavy iron door behind us. He walked to the steel table, opened the silver briefcase he had brought from the hotel, and pulled out a encrypted satellite terminal. "We have twenty-four hours before the Bennett Holdings board of directors convenes for an emergency vote in New York to name Richard acting CEO."