第21章 The Second Signal

It began, as such things always did for Margaret, with an intercept that should have been ordinary. February 1947. The war had been over for nearly two years, but the work had not stopped. It had only changed shape, flowing from the wooden huts of Bletchley Park into the grey office blocks of a new government organisation in the suburbs of London, a place with no name that anyone was supposed to say aloud and a door that opened onto a corridor of identical doors. Margaret walked through that door every morning at half past eight, hung her coat on the same hook, and set about teaching the mathematics of ciphers to a new generation of young men and women who had been children when she had first set foot in Hut 8. It was quiet work, and she was good at it. The girls and boys who passed through her classroom remembered her as exacting but fair, a woman who could reduce a three-hour lecture on rotor wiring to a single sentence and who had a disconcerting habit of knowing, before they opened their mouths, exactly what mistake they were about to make. Her favourite among them was a girl named Peggy Winslow, nineteen years old, with ink-stained fingers and a mind that moved sideways through problems the way a cat moves through long grass. Margaret saw something of herself in Peggy, and she tried not to let it show. The morning the second signal came, Peggy was the one who brought it to her. It arrived in the courier pouch with the rest of the morning intercepts, a thin stack of captured transmissions gathered by the listening stations that still dotted the coast. The war might have ended, but the ether was never silent. Someone was always transmitting, and someone was always listening, and the machines in the basement of the nameless office building clicked and chattered day and night, the last morse of an old war and the first morse of a new one. Margaret took the pouch to her desk and worked through it with the methodical care she had never lost. Most of it was routine. But one message made her stop. It was a short transmission, no more than three lines of encoded text, and it had been logged by the operator who received it as unremarkable. Margaret had almost passed over it herself. But something in the rhythm of the cipher caught her eye, the way a particular pattern of dots and dashes on a page can catch the eye of a man who has spent years watching for patterns. She had seen this rhythm before. She had decoded it before, in the winter of 1943, in a message that had predicted her death. It was Hayes's private cipher. The cipher that William Hayes had used to communicate with his German handler. The cipher that was supposed to have died with the network that Hayes had built and that Margaret and Dorothy and Frank had torn apart, piece by piece, in the long year that followed. She pulled the message to one side and worked on it for the rest of the morning, running the key settings through her head, writing columns of letters in the margins of the paper. It took her three hours to peel back the layers, but when the plaintext finally emerged, she wished she had never decoded it. The dead man has risen. He is watching the water. Ask the drowned man. Look to the dead. Margaret stared at the words until the letters swam before her eyes. The dead man had risen. He is watching the water. Ask the drowned man. It was the old language of the threat, the same grammar of fear that had been used to hunt her four years earlier, and it meant something. The dead man had risen. But Thomas Webb was dead. She had stood at the edge of his grave in the summer of 1944 and watched the coffin lowered into the earth. She had carried his memory with her ever since. Unless there was another dead man. She found Superintendent Brennan in his office on the fourth floor, in a room so small and so crowded with filing cabinets that it looked like a room that had forgotten it was an office. Brennan had aged in the years since the war, his hair gone fully grey, but his eyes were as sharp as ever, and he looked up the moment she closed the door. You have the look, he said. The look you had in the winter of 1943. Sit down, Margaret, and tell me what you have found. Margaret sat and told him. She laid the decoded message on his desk, and she watched his face as he read it, watched the careful blankness settle over his features like frost on a window. When he finished, he did not speak for a long time. Hayes is dead, he said at last. He died in prison in the summer of 1945. A heart attack, the doctors said. I saw the body myself. Then someone else knows his cipher, Margaret said. Someone who has been quiet for a long time. Someone who wants me to know they are still here. The dead man has risen, Brennan repeated. He is watching the water. Ask the drowned man. Do you know what it means? Not yet, Margaret said. But I know a man who was drowned. She told him about Thomas Webb again, about the fire that was supposed to have killed him and the fire that had nearly done so. And then she told him about a name she had come across in the summer of 1944, buried in the footnotes of an old personnel ledger she had spent a sleepless night reading: Alan Pemberton, a junior codebreaker assigned to Hut 6, who had drowned in a boating accident on the lake at Bletchley in September 1942, two years into Margaret's own time at the park. The name had meant nothing to her then. She had noted it, filed it, and moved on. But now it rose out of the depths of her memory like a body surfacing in still water, and she understood that nothing in the world of Bletchley Park had ever been an accident. I want to look into him, Margaret said. I want to know who he was, what he was working on, and why his death was not connected to the network when the network was dismantled. Brennan studied her for a long moment. This is not your war anymore, Margaret. You have given enough. You could walk away from this and no one would blame you. I know, Margaret said. But the message was sent to me. It was addressed in my cipher, and it asks about my dead. I did not walk away in 1943, and I will not walk away now. Brennan nodded slowly, and Margaret saw something in his eyes that might have been pride. Then he reached into his drawer and pulled out a key on a brass ring, worn smooth by years of use. The records from the park were moved to the new storage facility at Eastcote, he said. They are boxed and sealed, but they are not destroyed. If you want to find a drowned man, that is where you will have to look. Margaret took the key, and she felt its weight in her palm, the weight of the past, and she knew that the long night she had believed was over was not over at all. It had only been waiting for her, patient as the dead, to come back and finish what had been started. She was thirty years old, and she was still Margaret Chase, and she was going to look to the dead once more. ---