Emily Anderson led a double life. This shy musicologist from Galway was also a top codebreaker for the British, whose work would play a crucial role in Allied victory.

Helena Bonham Carter shines a light on extraordinary stories from World War Two. Join her for incredible tales of deception, acts of resistance and courage.

A BBC Studios Audio production for BBC Radio 4 and BBC Sounds.

Producer: Suniti Somaiya Assistant Producer: Lorna Reader Executive Producer: Paul Smith Written by Alex von Tunzelmann Commissioning editor for Radio 4: Rhian Roberts