Between Silk and Cyanide: Leo Marks Decodes SOE

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Between Silk and Cyanide: A Codemaker's War, 1941-1945

Leo Marks

New York: 1998

We're going to say it: if you read one book about codebreaking during the Second World War, make it Between Silk and Cyanide. There are several reasons for this. Leo Marks was front-and-centre in the battle for secure communications between intelligence agents and their headquarters. He knew where the bodies were buried, and his memoir corrects some historical misapprehensions. The stories in his book are highly entertaining, from the role of Sigmund Freud's chair in coding breakthroughs to the time he lost his trousers in front of Jack Benny (in Cairo). After reading Marks, you will understand a lot more about what the struggle in beleaguered London was like. Besides, you can watch all the Bletchley Park stories on your streaming services.

What Did Leo Marks Do in the War?

Leo Marks, MBE (1920-2001) wasn't picked for Bletchley because the instructors decided he wasn't a team player. Instead, they sent him to what a friendly sergeant called 'some potty outfit in Baker Street, an open house for misfits.' The potty outfit was officially known as Inter Services Research Bureau, but its real name was Special Operations, Executive, or SOE. Marks became their code chief.

Later in the war, Bletchley Park referred to Marks as 'the one who got away'. Marks's work was vital to Allied victory. A list of his accomplishments is also a breakdown of the major obstacles he faced. Some of those obstacles were placed there by the enemy. Others came from his own side.

  • When he joined SOE at age 21, Marks found that agents in the field were using a code based on poems they had memorised. Most of them were using beloved poems by well-known authors. Marks suggested gently that the Abwehr (German counterintelligence) had English poetry anthologies on their bookshelves, too. Instead, he gave the agents original poems, many of which he composed himself. The poems are often very good. Some contained shocking imagery. This would make decoding more difficult by non-native codebreakers. Still, poem codes were a terrible idea, he decided. They needed something safer.
  • Marks invented several safer alternatives: printed random letter tables on silk, printed random tables on waterproof paper, and, toward the end of the war, a mental coding trick. These inventions were viciously complicated to think of, and even harder to implement. Marks had to convince his bosses and work around office politics and inter-agency rivalries to gain approval for his ideas. Then he had to sweet-talk officials at the highest level in order to procure the necessary materials. Silk was in short supply. Marks managed all of this while being acutely aware of the danger the agents were running every day in occupied Europe. These codes could save lives.
  • Marks learned to spy on his fellow spies. For a couple of years, he secretly intercepted, decoded, and recoded the communications of the Free French. The reason? Nobody was supposed to know their 'secret code', but they didn't have any code experts to help them break the ones with mistakes in. Marks did a lot to help the French, but they never offered him a Croix de Guerre.
  • Marks also spent two years lobbying SOE in vain to realise that their network in the Netherlands was completely blown. He knew this because no Dutch agent had ever sent a code message with an error in it. Never. Marks reasoned that this was because the Dutch agents were all in prison, and the messages were being sent by Germans who had all the time in the world to get them right. Once, as a test, the SOE wireless operator ended a transmission with 'HH', for 'Heil Hitler'. When the operator on the other end reflexively sent back 'HH', Marks was convinced – but SOE's higher-ups were not. It was a bitter day when Abwehr Lieutenant Colonel Hermann Giskes sent them all mocking messages thanking them for all the supplies and information they'd sent over the course of the war1.

The Story of Violette Szabo

A sleep I shall have

A rest I shall have

Yet death will be but a pause.


– 'The Life That I Have' by Leo Marks

One incident from the code war has become famous. In 1943, Leo Marks lost his beloved fiancée Ruth to a wartime plane crash. In his grief, he penned the poem 'The Life That I Have.' In Between Silk and Cyanide, he describes writing the poem on Christmas Eve and reciting it on the roof of a building during the blackout.

Marks didn't intend to use it as a code poem, but in an emergency, he gave the poem to agent Violette Szabo. She kept misspelling her original poem, and she had only a short time before her departure for France.

Violette Szabo was captured, tortured, and killed by the Nazis in 1944. In 1958, a film called Carve Her Name with Pride was made. Marks allowed the poem to be used on condition that its author not be identified. In the film, it was said to be composed by Szabo's husband. In 1999, Leo Marks published a small book containing the poem, with illustrations by his wife Elena Gaussen Marks.

Postwar Notes

Leo Marks was the son of Benjamin Marks, co-owner of Marks and Co (the 'Co' stood for 'Cohen'), an antiquarian bookshop in London which was made famous by a US writer, Helene Hanff. Hanff published her extensive correspondence with the bookshop in a book called 84 Charing Cross Road, which became a bestseller, followed by a play and a film. Marks didn't follow in his father's footsteps. Instead, he became a playwright and screenwriter.

One of Marks's scripts became infamous, and nearly destroyed the career of its director, Michael Powell. The film is called Peeping Tom. British audiences in 1960 weren't ready for this psychological horror film about violence and voyeurism. However, filmmaker Martin Scorsese counts Peeping Tom as a major influence on his work. He helped get the film a wider release. He also asked Leo Marks to be in his film The Last Temptation of Christ. Marks, who described his own speaking voice as 'a deep brown melter', used it to great effect as the insinuating tones of Satan.

Last Word

'It would be a great help to him – and to us – if you could put down on half a sheet of paper the difference silk codes would make to our agents.'

... 'I think it could be done in a phrase, sir!'
But what?

'Oh?' said Courtauld. 'We'd be interested to hear it.'

'It's between silk and cyanide.'

There was a pause.


–  Between Silk and Cyanide, p 273

Between Silk and Cyanide is a must-read if you want to understand how the problems of coding and codebreaking affected the outcome of the Second World War. It's also a warm, insightful, and personal story by someone who was deeply involved in the day-to-day workings of SOE. You'll learn and be moved.

1After capture in 1945, Giskes worked for Allied intelligence, then became part of the Bundesnachrichtendienst.

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