“But the two of you continued to date,” Abby said.

“I started bringing her here on weekends. But she wasn’t supposed to be on the island the night she died.”

“Why was she here? Did you ever figure it out?”

“The only logical explanation is that she came here with her partner to steal the Phoenix stones.”

“I don’t understand,” Abby said. “Why would she think they were here in your lab? You said that those stones disappeared in the explosion at the mine.”

“That’s only half true. The stones that Ray Willis had removed for analysis and experimentation vanished. But my father escaped from that mine with a small number of geodes containing hot crystals. The stone in my ring is from one of them.”

Abby studied his ring, fascinated. “That’s one of the Phoenix crystals?”

“Yes. Dad split one of the geodes and removed three of the smallest crystals. He had them made into rings and gave one to my sister, Emma; one to my brother, Judson; and one to me. But so far they’ve served mostly as reminders of our obligation to protect the stones. We can run a little psi through them, but none of us has been able to figure out how to tap the full power of the latent energy in the crystals. And we’re not sure it would be smart to do so.”

“But you can sense that energy?”

He glanced at the ring. “Yes. The three crystals are all different. Even though they came out of the same geode, they are not the same in color, and they appear to have different properties. Emma, Judson and I each responded differently to them. Each of us chose the one that compelled us the most. This was the stone that somehow resonated with me.”

“Where are the rest of the Phoenix crystals?”

“They’re in a vault here in the basement. But that’s one of the problems with the scenario that I’ve been working on. I never told Cassidy about the stones. Never showed her the vault. As far as I knew, she had no knowledge of the Phoenix Mine or the rocks that Dad hauled out of it.”

“Yet somehow she came to know your family secrets.” Abby concentrated for a moment. “You said she was a talent with an affinity for stones that was similar to your own.”

“Right.”

Abby looked around the chamber. “She spent time in this lab with you. Maybe she could sense them.”

“I doubt it. They don’t actually give off a lot of energy unless you know how to tap into the heat. No one ever notices the one in my ring. It’s the same with the crystals Emma and Judson wear. Besides, the stones in the vault are shielded behind an inch of steel. But maybe her accomplice knew something she didn’t know.”

“You’re sure she had an accomplice?” Abby asked.

“It’s the only answer. He’s the one who killed her.”

“Why would he do that?”

“That’s one of the many things I don’t know,” he said. “The only thing I am sure of is that whoever was here that night, he or she did not get the vault open. The stones are still inside.”

“Could be her accomplice wasn’t all that good with locks,” Abby said.

“Even a first-rate locksmith with some serious talent wouldn’t be able to open the vault. It’s got a one–of–a–kind crystal mechanism. Designed it myself.” He held up his hand to show her the stone in his ring. “It can only be opened with one of the rings, and whoever did it would have to be able to push a little energy through the stone.”

“What about explosives?” Abby asked.

“Sure, you could blow the safe, but it would be an extremely dangerous operation, due to the unpredictable nature of the stones inside. Whoever was here that night knew better than to try that approach.”

“So Cassidy’s partner got this far that night, realized he couldn’t get into the safe and decided to cut his losses,” Abby said. “He started with his accomplice, Cassidy, the one person who could implicate him.”

“I think that’s how it went down. I also think it’s time you had a look at what this situation is all about.” He walked toward the far end of the room.

Abby trailed after him. “You’re going to show me the lock?”

“I’m going to open the vault and show you the stones. You’re in this as deep as I am. You have a right to see what my family has been protecting for the past forty years.”

He went to the far end of the room and pushed the concealed lever in the wall. A panel of fake stone slid open to reveal the steel door of the vault.

“That safe looks much newer than the rest of the house,” Abby said.

“It is. For years Dad used a top–of–­the-line security system designed by the head of our Black Box lab, Paul Lofgren. He was an old friend of my father’s. Lofgren died a few years ago. After I moved into this house, I wanted something more secure. I designed a new one. It was made to order by a firm in Seattle. I played around with various crystal devices until I came up with the obsidian lock and the Phoenix keys.”

Abby gave that some more thought. “Did anyone outside the family know that you changed the lock?”

“No. It was another Coppersmith family secret. You’re thinking that whoever arranged the burglary that night expected to find the old lock in place, aren’t you?”

“It might explain why things ended the way they did.”

“That’s my conclusion as well.”

He held his ring to the chunk of obsidian that was set into the wall and pushed a little energy through the crystal. The black stone glowed with dark light. The thick steel door swung open slowly. Faint currents of ghostly energy wafted out into the lab. Newton growled.

“I see what you mean,” Abby said. She moved closer to get a better look. “Whatever is inside doesn’t feel particularly hot. The vibes are definitely strange, however.”

Sam hit the switch that turned on the interior light. He watched her face when she saw the small pile of dull, gray rocks inside the vault. She looked disappointed. He smiled.

“Not very exciting, are they?” he asked.

“Nope. If I couldn’t sense a little of the energy, I wouldn’t give them another glance.”

“Each one is a geode. The hot crystals are inside. Dad split one of them, removed the three crystals for the rings and then decided he didn’t want to risk cutting into any of the other geodes. Too many unknowns.”

“Which one did he open?”

“This one.” He picked up half of the split geode and removed it from the vault. “Good old-fashioned rock on the outside, but take a look at what’s inside.”

He turned the cut geode to reveal the senses-dazzling interior.

Abby gazed in astonished wonder at the breathtaking array of multicolored crystals that filled the heart of the stone.

“Oh, my,” she breathed. “This is nature’s version of a Fabergé egg, except that the decoration is on the inside.”

“We think it may be more like nature’s version of a powerful furnace,” he said. “The problem is that we don’t know how to safely access the full force of the energy in even one of these geodes. We haven’t got the technology needed to control this kind of paranormal power.”

“You’re able to control the crystal in your ring in order to open the lock on the vault?”

“Sure, I can run a little psi through it, do a few parlor tricks.” He put the geode, cut side down, back inside the vault. “But I have no idea what would happen if I could channel the full power locked in it.”

Abby watched him close the vault door.

“What do you see in your dream?” she asked.

He reset the vault lock. “I see Cassidy walking along the hall to this room. I know she is going to open the door and come face–to–face with her killer. I try to call out to her, to warn her, but I can’t move, and she can’t hear me.”

“Tough dream,” Abby said.

“I’ve had better.”

“I know it won’t help, but I can tell you that I’ve got something similar going on,” she said.

He looked at her. “Bad dreams?”

“Worse than that. I’ve started sleepwalking. Gwen says I shouldn’t worry about it. She says it’s probably just temporary stress caused by the incident in the Vaughn library. But she also said that it might be my intuition trying to tell me that I’m overlooking something important.”