"Not terrifying. Just useful," he said, in an eminently reasonable tone. "You see, while you're hypnotized, I can plant a suggestion in your inner mind that will allow me to bring you instantly under my control again. All I have to do is go back to the subject we were last discussing."

"I'm sure it was quite boring," she said sarcastically. But the fear was growing with each word he spoke. He continued to smile at her. He admired her courage and her fighting spirit. But then, he thought, he could afford to admire it because he could mesmerize her again in an instant. He held the stone up before her. She quickly turned her face away.

"No, no, no," he said smoothly. "You have to look at the stone." She kept her eyes averted and a threatening edge crept into his voice. "I can have my men force you to do it if you refuse. But you will do it."

Reluctantly, she allowed her gaze to return to the stone. So blue. So deep. So beautiful.

Keren's voice seemed to come from a long way away. It was deep and soothing now. There was no threat in it.

"Just relax, Alyss. Relax and breathe deeply. That's the way. Good girl. Isn't this a much more pleasant way to behave?"

"Yes," she said dreamily. "Much more pleasant."

"Now, as I recall," his voice went on, seeming to fill her consciousness. "We were talking about your friend Will the last time."

"Will is a Ranger," she said. Deep within her mind there was a sense that she had said something wrong. Something she should have kept secret. For a moment, she felt a vague sense of revulsion at her craven behavior.

"Of course he is. We knew that anyway," said the soothing voice, and she felt a little better. If he knew, there was no harm in her telling. "But now I'm interested in those documents you burned. Tell me about them."

"There were no documents," she said. Again, on another level, her mind struggled to regain control. Her words were flat and unemotional and she couldn't stop herself as she realized she was revealing the most dangerous secret of all. "It was the acid you could smell."

His smile disappeared and a small frown took its place. He didn't understand…

"Acid? What acid?" he asked her quickly.

"Will put acid on the bars," Alyss said. Inside, her mind was screaming: Shut up! For God's sake, shut up! Will needs time to get away, you weak coward! Then, horrified, she heard herself saying the last few words.

"Will needs time to get away."

Comprehension dawned on Keren's face as she said it. He hurled himself out of the chair. All signs of the relaxed, casual attitude he had assumed were now dispelled as the chair crashed to the floor behind him. He reached the window in two long paces and tore the heavy curtain to one side.

The fumes were much stronger now as the acid continued to eat through the iron of the bars. Thin spirals of smoke rose from the bases of the two center bars, which he could see were surrounded by small pools of liquid. The acid, formerly clear, was now a rusty brown color as it destroyed the iron. Keren grasped the right-hand bar and tugged at it, breaking through the last threads of iron that held it in place. His eyes narrowed and he turned back toward Alyss.

"Where has he gone?" he demanded. Logic told him that Barton could not have escaped out of the window, although how he had made it into the room in the first place puzzled him.

It didn't occur to him that Will had never been inside the room itself. And, his eyes drawn by the fuming pools of acid around the two middle bars, he hadn't noticed the rope tied around the extreme left-hand bar.

There was no answer from Alyss. Overcome by the conflicting strain in her mind, she had collapsed in a faint as he erupted from his chair. She lay crumpled on the floor beside his overturned chair. Cursing quietly, he started toward her. He'd get the answer, he promised himself, if he had to beat it out of her. Then he stopped as he heard a slight creaking sound from the window. He spun back and this time he saw the loop of rope around the bottom of the bar. He dashed forward, cursing again as he leaned on the windowsill and burned his hand on a splash of acid. The rope was taut, the fibers creaking as it moved slightly with the weight of something-or someone-on the end.

In a second, Keren had his dagger out, reaching through the bars to saw at the taut rope, feeling the strands give way under the knife. He thought of summoning the guards outside Alyss's cell, then realized there were others closer to hand. He shouted at the top of his lungs to the sentries on the wall.

"Guards! Guards! Intruder in the castle! Intruder in the keep! Stop him!"

Far below, Will heard the shouts, felt the faint vibration on the rope as Keren sawed away with his knife. Knowing he had only seconds, he released his feet, letting them drop below him so that he swung in against the wall. Desperately, he scrabbled with his right hand for a handhold, finally finding a deep crevice between two of the granite blocks. Then he released his grip with the left hand and sought another vantage point. He had no sooner done so than the severed rope came tumbling down past him, coiling on the flagstones below like a giant serpent.

He was still seven meters from the bottom of the tower and he could hear the confused cries of the sentries on the ramparts behind him as they tried to make sense of Keren's words. He scrambled recklessly down, tearing skin and nails as he went, ripping the thick hose over his knees against the rough stone of the wall. With three meters to go, he let himself drop, landing like a cat, letting ankles and knees flex to take the shock. All around him, confused shouts were echoing as the sentries called to one another, trying to make out what was happening.

Four meters away, the door into the keep tower flew open and a sergeant, armed with a halberd-a combined ax and spear set on a long handle-dashed out, looking from left to right to see what was going on. Before the man noticed him, Will dashed the cowl back on his hood and stepped out into the half-light, pointing at the tangled pile of rope.

"He came this way!" he shouted. "After him! He's heading for the stables!"

It was only natural for the sergeant to react to the peremptory tone of command. In the confusion of the moment, the last thing he considered was that the person barking orders at him might be the very intruder he was looking for. He moved in the direction Will had indicated. As he came closer, he lost the advantage of his long-handled weapon, as Will intended.

Too late, he recognized the young face of the jongleur who had escaped the day before.

"Just a minute," he said, "you're-" Even before he finished the sentence, he lunged clumsily with the halberd. Will's saxe knife was in his hand and he deflected the heavy ax head to one side. Grabbing the sergeant's arm, turning and crouching in one movement, he threw him over his shoulder to the flagstones of the courtyard. The sergeant's head slammed into the hard stone. His helmet rolled to one side and he lay stunned.

Will grabbed the helmet and the long, heavy weapon. Then he paused to cut a length of rope from the pile before heading for the stairs. Far above in the tower, he could hear Keren shouting as he saw him running. Will started shouting too,, partly to drown him out and partly to add to the confusion.

"They're in the keep!" he yelled. "Hundreds of them! All guards assemble at the gatehouse!"

He pounded up the stairs to the battlements, continuing to shout a string of contradictory orders, directing men to the gatehouse, the keep and the north tower, clapping the sergeant's heavy iron helmet onto his own head as he went. Confusion was his best ally, he knew. That and the fact that he knew everyone he saw was an enemy, whereas the castle guards would have to identify each new person as they saw them.