"Monday morning, 9:00, about four minutes before I closed the door on him."
"Then the active field is still in its first-week phase. Good. Has anyone tried to drill or force the outer shell in the last 44 hours?"
"No. Carrington warned me about the epoxy."
"Good. Has the dial been spun more than three full rotations in the wrong direction by any of the previous locksmiths?"
Bradford turned to Walter. Walter shook his head.
"We tested gently. Nobody panicked the mechanism."
"Then I have a clean entry path. The vault doesn't know I'm coming."
She slid the silver ring off her index finger. She held it up to the light. Bradford saw for the first time that the inner band was etched with three tiny markings, almost invisible to the naked eye.
"Mr. Hayes, this ring contains a magnetic signature my father embedded during the design phase of your vault. He never told Carrington about it. He embedded it as a personal fail-safe in case any of his own designs ever needed to be bypassed for emergency entry. He told me about it on the day I turned twelve."
Bradford stared at the ring.
"Your father built a back door into my vault?"
"He built one into every Carrington magnetic interlock manufactured between 1998 and 2003. About 1,400 of them were installed worldwide. He never used it. He never told anyone. He said it wasn't for thieves. It was for emergencies."
The silence in the room was complete.
Walter spoke very quietly. "Henry told me once, 20 years ago, that he had built something into the design no one would ever find. I thought he was joking."
"He wasn't joking."
Bradford sat down on the marble floor. His knees would not hold him.
"Miss Davis, why didn't your father use this to prove the design was his?"
Harper slid the ring back onto her finger. "Because he was a better man than the industry that broke him. He said the ring was for emergencies only. Using it for anything else would make him no different from the people who stole from him."
She knelt back by her toolkit and picked up the resonance instrument.
"With your permission, Mr. Hayes, I'll begin the entry sequence. About six hours of preparation, then 38 seconds to open."
"Six hours?"
"The preparation has to be exact. If I rush, I trigger the epoxy. If I do it right, the door opens like a kiss."
Bradford nodded. He could not speak.
Harper looked at the readout: 44 hours, 4 minutes.
"We have time. Walter, I'll need you on the magnetometer at the south corner. Mr. Hayes, you do exactly one thing."
"Sit there. Don't speak unless I ask. When I call your name, you come immediately. Understood?"
"Understood."
She lifted the resonance fork. She struck it against the brass clasp of her toolkit. A pure, clear note rang out across the marble chamber. As it traveled, the inner panel of the vault, just for an instant, gave back the faintest answering hum.
Walter Brooks closed his eyes.
"My God, Harper, it's listening."