The Codebreaker Girl: A completely heartbreaking World War 2 page-turner

1930s, Poland. We hold our breath as the gears turn, waiting to see if years of work have paid off. The operator looks at me with tears in his eyes. He nods his head. We've done it. The code has been broken. But with war brewing, will it be enough to save us?

After graduating as the first and only woman on her university course, orphan Beata is set on joining the Polish Cipher Bureau. She's determined to save her country from invasion by cracking the Enigma code. But, as the Germans close in...