He watched them walk to the northwest corner of the graveyard.

There was a chicken-wire fence and, beyond that, the backyard of a house.

Rebecca and Bernd climbed over the fence.

That explains the sneakers, Walli thought.

What about the washing line?

• • •

The buildings on Bernauer Strasse were derelict, but the side streets were still occupied normally. Rebecca and Bernd, tense and fearful, crept across the backyard of a row house on such a side street, five doors from the end of the road where the Wall blocked it off. They climbed a second fence, then a third, each time moving closer to the Wall. Rebecca was thirty years of age, and agile. Bernd was older at forty, but he was in good shape: he had coached the school soccer team. They reached the back of the house third from the end.

They had visited the cemetery once before, again dressed in black to pose as mourners, their true purpose to study these houses. Their view had not been perfect—and they could not risk using binoculars—but they were fairly sure the third house offered a possible route up to the roof.

One roof led to another, eventually connecting with the empty buildings on Bernauer Strasse.

Now that Rebecca was closer, she was even more apprehensive.

They had planned their ascent by way of a low coal bunker, then an outhouse with a flat roof, and finally a gable end with a jutting windowsill. But all the heights had looked smaller from the cemetery. Close up, the climb appeared formidable.

They could not go inside the house. The occupants might raise the alarm: if they did not, they would be punished severely later.

The roofs were damp with mist, and would be slippery, but at least it was not raining.

Bernd said: “Are you ready?”

She was not. She was terrified. “Hell, yes,” she said.

“You’re a tiger,” he said.

The coal bunker was chest height. They climbed onto it. Their soft shoes made little sound.

From there, Bernd got both elbows over the edge of the flat outhouse roof and scrambled up. Lying on his belly, he reached down and hauled Rebecca up. They both stood on the roof. Rebecca felt dizzyingly conspicuous, but when she looked around she saw no one but a single distant figure back in the cemetery.

The next part was forbidding. Bernd got one knee up on the window ledge, but it was narrow. Fortunately the curtains were drawn, so that if there were people in the room they would not see anything—unless they heard a noise and came to investigate. With some difficulty he got his other knee on the sill. Leaning on Rebecca’s shoulder for support, he contrived to stand upright. With his feet now firmly planted, albeit on a narrow footing, he helped Rebecca up.

She knelt on the ledge and tried not to look down.

Bernd reached out to the sloping edge of the pitched roof, their next step up. He could not climb onto the roof from where he was: there was nothing to grab but the edge of a slate. They had already discussed this problem. Still kneeling, Rebecca braced herself. Bernd put one foot on her right shoulder. Holding the roof edge for balance, he put all his weight on her. It hurt, but she took the strain. A moment later his left foot was on her left shoulder. Evenly balanced, she could hold him—for a few moments.