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As a mathematician, Dr Hannah Fry specialises in understanding patterns of human behaviour.

Nowhere does the human factor smash headlong into the reality of numbers than in the secretive world of code-breaking.

In the last of three programmes, Hannah is delving into the ´óÏó´«Ã½ archives to present a fascinating selection of features all about codes, secrets and ciphers.

Plus insights galore from Hannah’s two experts who’ve got numbers and words covered: Maths teacher Bobby Seagull - author of ‘The Life-changing Magic of Numbers’ and Richard Rogan - editor of The Times Cryptic Crossword.

Featuring:

* THE BLETCHLEY GIRLS [´óÏó´«Ã½ Radio 4 2015]

* An extract from THE INFINITE MONKEY CAGE: GCHQ [´óÏó´«Ã½ Radio 4 2018]

Producer: Kevin Core

Made for ´óÏó´«Ã½ Radio 4 Extra and first broadcast in February 2020.