Krista would accompany that first assault team.

She intended to handle this personally.

After the prison was bombed and burning, the other helicopter would unload its men in a second wave. The two birds would continue their patrol, ready and waiting to evacuate on her orders.

Leaning forward, Krista stared below. The coordinates marked a massive square of stone ruins around a large garden. The space was wide enough to land a helicopter inside if necessary.

The pilot came on the line. "Waiting your mark," he said.

She lifted a fist and pointed her thumb down.

Time to end this.

3:24 P.M.

Gray sheltered with the others under the cloister's covered walkway. His ears rang from the blaring sirens. His head pounded from the concussions. Fountains of fire and smoke erupted all around them.

Gray understood the tactic of firebombing the prison.

Someone wants us trapped.

And he could guess who.

Seichan's bosses wanted them on a shorter leash. Had she informed them about how close Gray's team was to finding the key? Was this how they wanted to play their endgame?

Still, Seichan looked just as angry. Apparently she hadn't been informed of this change in plans.

"What are we going to do?" Rachel asked.

He couldn't answer. He knew there were many questions buried in that one. How were they going to get out of here? What about the promised antidote to her poisoning? Without the Doomsday key in hand, they had no bargaining chip.

They needed that key.

Just before the assault, something had begun to gel in Gray's mind. A vague idea, the whisper of a thought. But the sirens and bombs had blown it all away.

Something about the missing twelfth consecration cross.

Out of the smoke, a helicopter swooped into view. Its shadow fell over the yard as it skimmed to a hovering position. Rotorwash buffeted the enclosed space, flattening the flowers and shaking the bushes.

Gray and the others had nowhere to run.

As he faced the garden, he suddenly knew the answer. There was no calculation, no piecing it together. It formed fully in his head.

Time slowed to a crawl.

He remembered his fixation with the old abbey map at the Troyes library. He knew what had nagged at him. There had been a pagan cross inscribed on that very page. Back at the library, he had missed it, failed to recognize it in that context. In his mind's eye, he saw it clearly now.

The pagan cross represented the earth quartered into its primary corners: east, west, north, south.

Just like the map's compass.

Gray stared into the garden-at the decoration that graced the middle of the yard. The compass was an ornate brass construction that rested on a waist-high stone plinth. The compass was sculpted with elaborate frills, each of the four cardinal directions clearly marked, along with many gradations in between.

The twelfth consecration cross-though disguised in this new incarnation-had been in plain sight all along.

If Gray had any doubt, he reminded himself of one other thing. The compass stood in the center of the courtyard, surrounded by stones marked with sacred symbols. Such a spot was the most hallowed ground to the ancients who raised those old stones.

Gray knew what he had to do.

He swung to the guard and pointed to the hovering helicopter as its hatches were thrown open. "Fire!"

But the guard looked terrified. He was young, likely new, assigned to babysit the tour groups. He was out of his league.

"Well, if you're not going to..." Kowalski grabbed the gun out of the guard's stunned hands. "Let me show you how it's done."

He sprang up, aimed, and began shooting at the helicopter. Men dove away from the open hatch. One drop line tumbled loose and writhed as the helicopter yanked up and off to the side, caught by surprise at the gunfire.

Gray knew he had moments to confirm his theory.

"Kowalski, you hold off that bird! Everyone else, with me!"

Gray ran into the garden and headed toward the compass. "Get around it!" he ordered as he gripped the large brass N.

Wallace, Rachel, and Seichan manned the other cardinal directions.

"We have to turn it! Like at the tomb on the island. Make it twist like a spiral!"

Gray dug his toes into the lawn, planted his shoulder, and pushed. The others did the same. Nothing happened. It wouldn't budge. Was he wrong? Were they turning it in the right direction?

Then suddenly it gave way. The entire compass lurched, rotating around its brass hub.

Rifle shots blasted from Kowalski's position.