Chapter 8 - The Apprentice Who Held the Key

Jo was twenty-three, brilliant with control panels, and terrified of disappointing anyone. I had hired her after she finished trade school because she had spent her interview correcting a mistake in my own wiring diagram.
Now someone had threatened her younger brother to force her into Mercer's plan.
We told the detective everything. Jo's last known location was an equipment rental yard near O'Hare. Officers found her brother safe at a friend's house, then traced a van seen leaving the yard.
While they searched, I reviewed the maintenance work Jo had performed at Dominic's mansion. She had installed a network relay for the courtyard lighting three months earlier. She'd believed it was part of a legitimate security upgrade. Mercer had given her the drawings.
One line on the invoice caught my eye: TEST MODE—17.
I remembered my father's notebook. Subject seventeen. Timer seventeen. It wasn't a person. It was the name of the controller program.
The investigators had already seized the original controller, but a second device might still be active. Jo had mentioned a redundant relay in the mansion's generator room. We arranged for a licensed team, accompanied by investigators, to inspect it.
Inside the generator room, I found the backup module behind a panel labeled FIRE SYSTEM AUXILIARY. The label was false. The module could send timed commands to devices on the building network, including the bedroom equipment investigators had removed. It also contained logs of test sessions.
Sofia took one look at the date list and went pale. Several sessions corresponded to nights Dominic had suffered severe episodes.
We preserved the module for forensic examination. We didn't need to turn it on to know it was important.
That afternoon police located Jo in a motel outside the city. She was frightened but unharmed. She admitted that Mercer had ordered her to install the relay and later demanded she erase the work orders. She'd refused to destroy the records, so he'd threatened her family.
“I'm sorry,” she told me through tears.
“You should have told me.”
“I thought he'd kill my brother.”
“I know. But now we tell the truth and let people help.”
Jo agreed to give a formal statement and provide copies of the messages.
Dominic was waiting outside the interview room when I emerged. He held two coffees, one with enough cream to qualify as dessert.
“How did you know?” I asked.
“Your apprentice told me.”
“You talked to Jo?”
“I asked whether you had eaten. She said you forget food when you're worried.”
I took the coffee. “That's annoyingly observant.”
He smiled, then grew serious. “The doctors called. My latest tests don't show evidence of an ongoing seizure disorder in the way Voss described it. They still want follow-up. They think some episodes may have been provoked or worsened by exposure to substances in the medication, but they won't make a final conclusion until the investigation is complete.”
“That's good news.”
“It's complicated news.”
“Most good news is.”
He looked down at his hands. “I don't know who I am without the fear of the next episode.”
“You're the man who brought me coffee.”
He laughed softly.
Then he said, “When this is over, I'm going to ask you to dinner again.”
“I know.”
“And?”
“Ask me when it's over.”
Before he could answer, Sofia approached with her phone. Police had intercepted a call from Vittorio's associate. Mercer was returning to Chicago, not fleeing it.
He wanted one thing: the original signed trust agreement, stored in Dominic's father's safe.
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And only one person knew the combination.
Dominic.