“Sorry?”

“Forget it.”

He pushed open a door and switched on the light. His office was little more than a gloomy cupboard, a cell, its solitary window opening on to a courtyard of blackened brick. One wall was shelved: tattered, leather-bound volumes of statutes and decrees, a handbook on forensic science, a dictionary, an atlas, a Berlin street guide, telephone directories, box files with labels gummed to them — “Braune”, “Hundt”, “Stark”, “Zadek” — every one a bureaucratic tombstone, memorialising some long-forgotten victim. Another side of the office was taken up by four filing cabinets. On top of one was a spider plant, placed there by a middle-aged secretary two years ago at the height of an unspoken and unrequited passion for Xavier March. It was now dead. That was all the furniture, apart from two wooden desks pushed together beneath the window. One was March’s; the other belonged to Max Jaeger.

March hung his overcoat on a peg by the door. He preferred not to wear uniform when he could avoid it, and this morning he had used the rainstorm on the Havel as an excuse to dress in grey trousers and a thick blue sweater. He pushed Jaeger’s chair towards Jost. “Sit down. Coffee?”

“Please.”

There was a machine in the corridor. “We’ve got fucking photographs. Can you believe it? Look at that.” Along the passage March could hear the voice of Fiebes of VB3 — the sexual crimes division — boasting of his latest success. “Her maid took them. Look, you can see every hair. The girl should turn professional.”

What would this be? March thumped the side of the coffee machine and it ejected a plastic cup. Some officer’s wife, he guessed, and a Polish labourer shipped in from the General Government to work in the garden. It was usually a Pole; a dreamy, soulful Pole, plucking at the heart of a wife whose husband was away at the front. It sounded as if they had been photographed in flagrante by some jealous girl from the Bund deutscher Madel, anxious to please the authorities. This was a sexual crime, as defined in the 1935 Race Defilement Act.