Gun in hand, he edged around the tower.

At the first corner he found himself looking west the length of Nevsky Prospekt. In the clear light he could see the Alexander Garden and the Admiralty at the far end. In the middle distance the street was crowded, but nearby it was empty. The sniper must still be at work.

Grigori listened, but heard no shots.

He sidled farther around the tower until he could look around the next corner. Now he could see all along the north wall of the church. He had felt sure he would find the sniper there, flat on his belly, shooting between the uprights of the parapet-but there was no one in sight. Beyond the parapet he could see the wide street below, with people crouching in doorways and skulking around corners, waiting to see what would happen.

A moment later, the sniper's rifle rang out. A scream from the street told Grigori the man had hit his target.

The shot had come from above Grigori's head.

He looked up. The bell tower was pierced by glassless windows and flanked by open turrets placed diagonally at the corners. The shooter was up there somewhere, firing out of one of the many available openings. Fortunately, Grigori had remained hard up against the wall, where he could not have been seen by the sniper.

Grigori went back inside. Within the confined space of the stairwell his rifle felt big and clumsy. He put it down and took out one of his pistols. He knew by its weight that it was empty. He cursed: loading the Nagant M1895 was slow. He took a box of cartridges from the pocket of his uniform coat and inserted seven of them, one by one, through the revolver's awkward loading gate into the cylinder. Then he cocked the hammer.

Leaving the rifle behind, he went up the spiral stairs, treading softly. He moved at a steady pace, not wanting to exert himself so much that his breathing would become audible. He kept his revolver in his right hand pointing up the stairs.

After a few moments he smelled smoke.

The sniper was having a cigarette. But the pungent smell of burning tobacco could travel a long way, and Grigori could not be sure how close the man was.

Ahead and above he saw reflected sunlight. He crept upward, ready to fire. The light was coming through a glassless window. The sniper was not there.

Grigori climbed farther and saw light again. The smell of smoke grew stronger. Was it his imagination, or could he sense the presence of the sniper just a little farther around the curve of the stairwell? And, if so, could the man sense him?

He heard a sharp intake of breath. It shocked him so much that he almost pulled the trigger. Then he realized it was the noise a man made when inhaling smoke. A moment later he heard the softer, satisfied sound of the smoker blowing out.

He hesitated. He did not know which way the sniper was looking or where his gun might be pointing. He wanted to hear the rifle fire again, for that would tell him that the sniper's attention was directed outward.

Waiting might mean another death, another Yakov or Varya bleeding on the cold cobblestones. On the other hand, if Grigori failed now how many more people would be brought down by the sniper this afternoon?

Grigori forced himself to be patient. It was like being on the battlefield. You did not rush to save a wounded comrade and thereby sacrifice your life. You took chances only w

hen the reasons were overwhelming.

He heard another intake of breath, followed by a long exhalation, and a moment later a crushed cigarette stub came down the staircase, bouncing off the wall and landing at his feet. There was the sound of a man shifting position in a confined space. Then Grigori heard a low muttering, the words sounding mostly like imprecations: "Swine. . . revolutionaries. . . stinking Jews. . . diseased whores. . . retards. . . " The sniper was winding himself up to kill again.

If Grigori could stop him now it would save at least one life.

He went up a step.

The muttering continued: "Cattle. . . Slavs. . . thieves and criminals. . . " The voice was vaguely familiar, and Grigori wondered if this was a man he had met before.

He took another step, and saw the man's feet, shod in shiny new police-pattern black leather boots. They were small feet: the sniper was a diminutive man. He was down on one knee, the most stable position for shooting. Grigori could now see that he had positioned himself inside one of the corner turrets, so that he could fire in three different directions.

One more step, Grigori thought, and I will be able to shoot him dead.

He took another step, but tension caused him to miss his footing. He stumbled, fell, and dropped his gun. It hit the stone step with a clang.

The sniper uttered a loud, frightened curse and looked around.

With astonishment, Grigori recognized him as Pinsky's sidekick, Ilya Kozlov.

Grigori grabbed for his dropped gun and missed. The revolver fell down the stone staircase with agonizing slowness, one step at a time, until it came to rest well out of reach.

Kozlov began to turn, but he could not do so quickly from his kneeling position.

Grigori regained his balance and went up another step.