"What was that scream?" Bernd asked urgently.

"A woman in the bedroom saw me. I don't think she could have been heard on the street, though."

"But she might raise the alarm."

"Nothing we can do. Let's keep going."

They edged crabwise across the pitched roof. The houses were old and some of the roof slates were broken. Rebecca tried not to put weight on the gutter that her feet were touching. Their progress was painfully slow.

She imagined the woman at the window talking to her husband. "If we do nothing we'll be accused of collaborating. We could say we were fast asleep and didn't hear anything, but they'll probably arrest us anyway. And even if we call the police they might arrest us on suspicion. When things go wrong they arrest everyone in sight. Best just to keep our heads down. I'll draw the curtains again."

Ordinary people avoided any contact with the police--but the woman at the window might not be ordinary. If she or her husband was a party member, with a soft job and privileges, they would have a degree of immunity from police harassment, and in those circumstances they would undoubtedly raise a hue and cry.

But the seconds ticked by, and Rebecca heard no sound of a commotion. Perhaps she and Bernd had got away with it.

They came to an angle in the roof. Bracing his feet on the opposing sides, Bernd was able to crawl upward until he got his hands over the roof ridge. Now he had a safer grip, though he ran the risk that his dark-gloved fingertips might be noticed by the police on the street.

He turned the angle and crawled on, every second getting nearer to Bernauer Strasse and freedom.

Rebecca followed. She glanced over her shoulder, wondering if anyone could see her and Bernd. Their dark clothing was inconspicuous against the gray slates, but they were not invisible. Was anyone watching? She could see the backyards and the cemetery. The dark figure she had noticed a minute ago was now running from the chapel toward the cemetery gate. A leaden fear made her stomach cold. Had he seen them, and was he hurrying to warn the police?

She suffered a moment of panic, then she realized the figure was familiar.

"Walli?" she said.

What the hell was he up to? Obviously he had followed her and Bernd. But to what end? And where was he heading in such a hurry?

There was nothing she could do but worry.

They came to the back wall of the apartment building on Bernauer Strasse.

The windows were boarded up. Bernd and Rebecca had talked about breaking through the boards to get in, then breaking through another set at the front to get out, but they had decided it would be too noisy, time-consuming, and difficult. Easier, they guessed, to go over the top.

The ridge of the roof they were on was at the level of the gutters of the high adjacent building, so they could easily step from one roof to the next.

From then on they would be clearly visible to the guards with the machine guns on the side street below.

This was their most vulnerable moment.

Bernd crawled up the house roof to the ridge, straddled it, then scrambled up onto the higher roof of the apartment building, heading for the top.

Rebecca followed. She was breathing hard now. Her knees were bruised and her shoulders ached where Bernd had stood on them.

When she was straddling the lower roof she took a look down. She was alarmingly close to the policemen on the street. They were lighting cigarettes: if one should glance upward, all would be lost. Both she and Bernd would be easy targets for their submachine guns.

But they were only a few steps from freedom.

She braced herself to wriggle onto the roof in front of her. Beneath her left foot something moved. Her sneaker slipped, and she fell. She was still astride the ridge, and the impact hurt her groin. She gave a muffled cry, leaned vertiginously sideways for a horrifying moment, then regained her balance.

Unfortunately the cause of her stumble, a loose slate, slipped down the roof, tumbled over the gutter, and fell to the street, where it shattered noisily.

The cops heard the sound and looked at the fragments on the pavement.

Rebecca froze.

The police looked around. Any second now it would occur to them that the slate must have fallen from the roof, and they would look up. But, before they did, one was hit by a flung stone. A second later, Rebecca heard her brother's voice yelling: "All cops are cunts!"

*