Map of Bones (Sigma Force 2)

Vigor ticked off on his fingertips. “Electricity, lightning, light, knowledge, power. They’re all related. And somewhere there is a symbol of this, built into the design of the palace.”

Kat shook her head, at a loss.

Vigor suddenly stiffened.

“What?” She stepped closer.

Vigor quickly knelt and drew in the dust. “Alexander’s tomb was in Egypt. We can’t forget to carry that forward, one riddle to the next. The Egyptian symbol for light is a circle with a dot in the center. Representing the sun.

“But sometimes it’s flattened into an oval, forming an eye. Representing not only the sun and light, but also knowledge. The burning eye of insight. The all-seeing eye of Masonic and Templar iconography.”

Kat frowned at the drawings. She had seen no such markings. “Okay, but where do we begin looking for it?”

“It’s not going to be found—but formed,” Vigor said, standing up. “Why didn’t I think of this before? A feature of Gothic architecture is the mischievous play of light and shadow. The Templar architects were masters of this manipulation.”

“But where can we—?”

Vigor cut her off, already heading out the door. “We have to go back down to the first floor. To where we already saw the potential for a flaming eye within a circle of light.”

Kat followed Vigor. She didn’t recall any such depiction. They hurried down the stairs and out of the Tower of Angels. Vigor led the way across a banquet hall and ended up in a room they’d already explored.

“The kitchen?” she asked, surprised.

Kat stared again at the square walls, the central raised hearth, and overhead, the octagonal chimneypiece. She didn’t understand and began to say so.

Vigor reached out a hand and cupped it over her penlight. “Wait.”

A brilliant bolt of lightning shattered outside. Enough illumination traveled down the open chimney to shine a perfect oval upon the fire pit. The silver light flickered, then went dark.

“As it is above, so it is below,” Vigor said in a hushed voice. “The effect is probably more evident when the noon sun climbs directly overhead or lies at some precise angle.”

Kat pictured the firepit ablaze, bright with flames. A fire within a circle of sunlight. “But how can we be sure this is the right place?” Kat asked, circling the hearth.

He frowned. “I’m not entirely sure, but Alexander’s tomb was under a lighthouse topped by a fiery flame. And considering the usefulness of both a lighthouse and a kitchen, it makes sense to bury something beneath a location that serves a good function. Successive generations would preserve it for its utility.”

Unconvinced, Kat bent down and slipped a knife free to examine the central hearth. She dug at the rock that lined the firepit, exposing an orange-hued stone at the base. “It’s not hematite or magnetite.” If it had been either one, she might be convinced. “It’s just bauxite, an aluminum hydroxide ore. A good thermal conductor. Makes sense for a fireplace. Nothing unusual.”

She glanced over to Vigor. He wore a large grin.

“What?”

“I walked right past it,” Vigor said, joining her. “I should have considered that another stone would point the way. First hematite, then magnetite, now bauxite.”

Kat stood, confused.

“Bauxite is mined right here in this area. In fact, it’s named after the Lords of Baux, whose castle lies only ten miles from here. It sits atop a hill of bauxite. This stone points a finger back at them.”

“So?”

“The Lords of Baux had an uneasy relationship with the French popes, their new neighbors. But they were best known for an odd claim they asserted most vehemently. They claimed to be descended from a famous biblical figure.”

“Who?” Kat asked.

“Balthazar. One of the Magi.”

Kat’s eyes widened. She turned back to the hearth. “They sealed the opening with stones from the Magi’s descendants.”

“Do you still doubt we’ve found the right spot?” Vigor asked.

Kat shook her head. “But how do we open it? I don’t see any keyhole.”

“You already told us. Electricity.”

As if emphasizing the point, thunder boomed through the thick walls.

Kat shed out of her pack. It was worth a try. “We don’t have any of those ancient batteries.” She pulled out a larger flashlight. “But I have some modern Duracell Coppertops.”

She cracked open her flashlight and used the tip of a knife to tease loose the positive and negative wires. With the power switch off, she twisted them together, then lifted her handiwork.

“You’d better stand back,” Kat warned.

Reaching out, she brought the flashlight’s wires into contact with the bauxite stone, a weakly conductive ore. She flicked the flashlight’s switch.

An arc of electricity stabbed to the stone. A deep bass tone responded as if a large drum had been struck.

Kat darted back as the tone faded. She joined Vigor by the wall.

Along the edges of the stone hearth, a fiery glow spread, scribing the entire firepit.

“I think they’ve cemented the blocks with molten m-state glass,” Kat mumbled.

“Like the ancient Egyptian builders used molten lead to cement the Pharos Lighthouse.”

“And now the electricity is releasing the stored power in the glass.”

Other traceries of fire jittered across the face of the hearth, outlining each and every stone. It flared brighter, searing a crisscrossed pattern onto her retina. Heat washed out toward them.

Kat shielded her eyes. But the effect didn’t last long. As the glow faded, the stone blocks of bauxite began to fall away, no longer cemented, tumbling down into a pit hidden below the hearth.

Kat heard the crash of stone on stone. A rattling continued as the blocks tumbled deeper. No longer able to restrain her curiosity, she stepped forward and shone her penlight. The edges of the hearth now outlined a dark staircase leading down.

She turned to Vigor. “We’ve done it.”

“Heaven help us,” he said.

3:52 A.M.

LAUSANNE, SWITZERLAND

A QUARTER mile from his castle, Raoul lowered his cell phone and stalked away from his truck. Fury narrowed his vision to pinpoints. Blood dripped from a scalp wound. That Asian bitch had betrayed him. But he would get his satisfaction. His dogs would make short work of all of them.

And if not…

He crossed to the second truck. He pointed to two men. “You and you. Return to the chateau. On foot. Stand guard at the portcullis. Shoot anyone you see move. No one leaves that courtyard alive.”