He sighed and his attention strayed to the second item on the table, a letter, neat blue words on cream paper. He set the senior management report aside, picked up the letter and began to read it once again.

Dear David,

I have to put this in writing, because I haven’t been able to find the words to say aloud…

He reached the end and sat lost in thought, feeling the drag of sadness inside him, the weight of time and loss. As if to emphasise this, his eyes moved to a small framed picture on the wall in front of him, a shabby little thing, a gift from a murderer. He remembered his first glimpse of it, long ago, above the mantelpiece of a house in Stepney as he kneeled on the floor with the body of Emily Crab, trying in vain to stop the flow of blood from her throat. Emily had ruined his suit but established his reputation on his first big murder case. Later, interviewing her husband, he had asked about the little picture, saying that it had looked to him like the work of the German artist Kurt Schwitters, whom he greatly admired. Walter Crab had been surprised and gratified by this recognition. He told Brock that during the war his mother had taken in a refugee, a man who had been hunted by the Gestapo from Germany to Norway, before escaping to London. The man was penniless, and Walter’s mother had accepted the picture in lieu of a month’s rent and board. When her friends saw it-an old bus ticket, a scrap of a newspaper headline and other fragments glued to a piece of cardboard-they laughed and told her she’d been had, and Walter had been mortified on his mother’s account. Brock was the first person who had ever admired it, and yes, on the back was the signature K. Schwitters, and the title, Merz 598a, London, 1943. Then Walter confessed to Brock that he had murdered Emily and that the alibi provided by his sister was false.