Chapter 31 The Question of Meridian

The requisition form lay on Margaret's desk like a guilty confession, and she sat with it for two full days before she did anything else, because there are some documents that require a certain patience to read — not a single reading will suffice, because they are written in the language of people who know what they have done and who expect you to figure it out on your own. Edmund Hale had signed that form in September of 1942, the same month the order went out to drag Alan Pemberton from the North Sea and bury him at the bottom of the estuary. The signature was his. She knew every one of his signatures. He had signed requisitions for tea cups and carbon paper and replacement lamps, and the loop of his H was as distinctive as a fingerprint. Dorothy came to her room on the evening of the second day, carrying a thermos of tea and a sandwich that had been cut into triangles and eaten only at the corners, the way people eat when they are not actually hungry but need the ritual of eating to continue the conversation. She set the plate on the desk, pushed the requisition form closer to herself, and looked at it for a long time without speaking. So, she said at last. You found him. I found his signature, Margaret said. I have not found him. Not yet. That is not the same thing. No. It is not. It is less. A signature is a shadow cast by a hand, and the hand is still there, moving. Dorothy looked at her across the desk, and the lamplight threw her face into sharp relief, the way it always did when she was about to say something Margaret did not want to hear. What are you going to do with it? I do not know. Margaret leaned back in her chair and closed her eyes. For the first time since she had come back from Norfolk, since she had stood in the boathouse and found the tin box and the photograph with the torn corner and the note that said ask him what he carried, she felt the full weight of what she was carrying. It was not just a signature. It was a man who had signed the requisition that drowned a codebreaker. It was a man who had then risen through the organisation, who had moved from Hut 6 to the new department without anyone asking too many questions. It was a man whose name was Meridian, who had been writing keys for a reader that did not yet have a name, and who had sent a message to Margaret in a cipher built on the bones of a key used the same month Alan Pemberton died. He had been watching her for years. He had known about the key she kept in her safe. He had known about the photograph in her pocket. You cannot take him to Scotland Yard, Dorothy said. Why not? Because they will ask him to explain, and he will explain, and the explanation will sound reasonable, and they will send him home with a warning and a file stamped Confidential, and he will walk back into this building and sit at his desk and sign another requisition, and you will be back where you started. Margaret opened her eyes. He is not just an administrator, Dorothy. He is a bridge. He connected the old war to the new one. If you take him to the police, you take him out of his context, and you lose the thing that makes him dangerous. You lose the reader. Then we find the reader. We already have one piece of the key, Margaret said. Voss's key. It is unbroken, according to the Fisherman. We can read his traffic. We can read what Meridian is saying to whoever he is saying it to. And when we can read the messages, we will know who the new reader is, and we will know what they are planning, and we will know why they wrote to me in September. Dorothy was quiet for a long moment. Then she said, And what do you think they wanted you to know? Margaret looked at the requisition form, at the loop of Hale's H, at the date that had been so careful, so deliberate, in its placement — the fourteenth of September, the same month as Pemberton's drowning. I think they wanted me to look at him, she said. I think they have been waiting for me to find him, the way the Fisherman waited for me to find the boathouse. This is an introduction, Dorothy. Just like the last one. The last one told me the Fisherman was alive. This one tells me the foundation is there, that the wall has a base, that I should stop looking at the ashes and start looking at the architect. And are you going to? I am going to work, Margaret said. She picked up the key, the one Voss had pressed into her hand in Flensburg, the one that lay in her safe with the cold patience of a loaded weapon. I am going to sit down, and I am going to read what this key unlocks, and I am going to find out who Meridian has been writing to for the last five years. She stood up and walked to the safe, and she opened it, and she took out the key, and she carried it back to the desk the way you carry something hot. Then she sat down, and she put on her glasses, and she began to work. Dorothy watched her for a moment, the familiar sight of her at the desk in the lamplight, pencil moving, mind working, the way a woman works when she has decided that knowing is the same thing as doing. Then Dorothy blew out the lamp, left the thermos and the plate and the triangle sandwiches, and went home through the grey London night, leaving Margaret alone with the key and the signature and the long, slow work of reading what someone had spent five years writing in code. She did not stop until three in the morning, and when she finally looked up, her neck was stiff and her eyes were raw and the city outside her window was full of people who were sleeping and dreaming and living their ordinary lives, and none of them knew that across the road from Euston station, in a room lit by a single green-shaded lamp, a woman was reading the first message of the new war. The message was short. It was addressed to a set of coordinates near the North Sea, and it carried the kind of language that diplomats use when they are talking about things that are not diplomatic. But Margaret had learned to read diplomacy in the gaps between the words, and what she found in the gaps was enough to make her hand shake for the first time since she had decoded the message that predicted her death. Meridian had been communicating with a man in Helsinki. A man whose name, when Margaret looked it up in the files Brennan had assembled, turned out to be someone she had met once, at a conference in 1946, a Finnish signals officer who had been polite and unremarkable and had asked her about Bletchley over drinks. She had forgotten him completely. The message ended with a single instruction: Watch the woman at Euston. She has what we need. Margaret looked down at the key in her hands. The Fisherman had said his handlers believed the key was unbroken. He had not mentioned who they were watching.