Part Three: The Hidden Modification

Callum and Elise worked through the afternoon. They pulled the flight management software. They cross-referenced it against the backup archive. They found the modification.

“Here it is,” Elise said.

Callum leaned over the monitor. “What am I looking at?”

“Embedded subroutine in the fuel pressure alerting protocol. The threshold was reduced by a factor of three during cruise phase.”

“Meaning the system wouldn’t trigger a cockpit alert until the pressure variance was severe.”

“Exactly. The pilots wouldn’t know there was a problem until it was too late.”

“What’s the threshold?”

“Forty-two seconds. Under normal parameters, the system would trigger at twenty-two seconds. This one waits forty-two.”

“That’s a 20-second delay.”

“Yes.”

“At 38,000 feet, 20 seconds is the difference between a safe approach and an emergency landing.”

“Or worse.”

Callum straightened. “Who authorized this modification?”

“Executive-level account. Gideon’s credentials.”

“Was he here?”

“The building access log shows his credential was used at 4:41 AM, two days ago. His calendar shows him at a dinner function in Dallas.”

“That dinner ended at 9:30. He had plenty of time.”

Elise scrolled to another screen. “There’s more. The modification was pushed through a routine update file. No one would have noticed it.”

“Unless someone was looking for it.”

“Like us.”

“Exactly.”

Callum pulled out his phone. “I need to talk to Verona.”

“She’s in the boardroom. Gideon called an emergency meeting.”

“That’s convenient.”

“Very.”

Callum walked to the boardroom. He didn’t knock. He opened the door and stepped inside.

Six board members were seated at the table. Gideon was at the head. Verona was at the other end. She looked up as Callum entered.

“This is a closed meeting,” Gideon said. “You’re not authorized to be here.”

“I’m the contractor who found the problem. I’m authorized.”

“This has nothing to do with the aircraft. This is a governance issue.”

“Everything’s connected, Mr. Concaid. The aircraft. The deadline. The pressure to make a deal that benefits someone.”

Gideon’s face remained composed. “I have no idea what you’re talking about.”

“Four-point-three seconds. That’s the pressure cycle. You know what that means, don’t you?”

“I’m a COO. Not a mechanic. I don’t know the technical details.”

“Someone does. Someone with your credentials modified the fuel pressure alerting protocol.”

“That’s a serious accusation.”

“It’s a serious problem.”

Verona stood. “Gideon, is this true?”

“I don’t know what he’s talking about.”

“Your credentials were used to push a modification. Your building access log shows you were here at 4:41 AM, two days ago.”

“Someone could have stolen my credentials.”

“Could have.”

“I’m being framed.”

“Warren said the same thing. Now you’re saying it. That’s a pattern.”

Gideon’s composure cracked. “This is absurd. I’ve been with this company for six years. I’ve helped build it.”

“You’ve also been pushing for the Meridian sale.”

“That’s a strategic difference. Not a betrayal.”

“Strategic differences don’t involve sabotaging aircraft.”

“I didn’t sabotage anything.”

“Then who did?”

Gideon didn’t answer.

Callum stepped forward. “Let me show you something.”

He pulled up the modification on his tablet. “This subroutine was embedded in a routine update file. It was designed to avoid detection. Unless someone was specifically looking for it.”

“And you were specifically looking for it?”

“I was looking for anything that didn’t make sense. This didn’t make sense.”

Gideon’s face was pale. “I still don’t see what this has to do with me.”

“Your credentials. Your access. Your calendar. All the pieces point in one direction.”

Gideon laughed. “You’re a mechanic. You don’t have the authority to make these accusations.”

“I don’t need authority. I just need evidence.”

“And you think you have it?”

“I know I have it.”

Verona spoke. “Gideon, I think you should leave.”

“This is my company as much as yours—”

“It’s my company. My father’s name is on the door. If you have an explanation, you can give it through your attorney.”

Gideon stood. “You’re making a mistake.”

“Maybe. But I’m making it based on evidence.”

Gideon walked to the door. He paused and looked back at Callum.

“You’ll regret this,” he said.

“I already regret not seeing it sooner.”

Gideon left. The boardroom was silent.

Verona sat down heavily. “I trusted him.”

“You trusted the wrong person.”

“I know that now. What I don’t know is what to do next.”

“You ground the aircraft. You seal the data systems. You bring in an independent investigator.”

“That’s what my father said.”

“Your father’s right.”

Verona looked at Callum. “You’re very calm for someone who just exposed a conspiracy.”

“I’m always calm.”

“That’s not normal.”

“Yes, it is. When you’ve seen enough, you learn to stop reacting. You just observe.”

“Observe what?”

“The pattern. The way people act when they’ve been found out. The way they scramble to cover their tracks.”

“And you’ve seen that before?”

“Many times. Different context. Same structure. People lie. Evidence is the only thing that tells the truth.”

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