Hedda by Peter Haden is an enjoyable historical fiction. It is intelligent, the main characters are intriguing, and the narrative is grounded in the history
Codebreaker Girls: A Secret Life at Bletchley Park is a non-fiction account of the life of Daisy Lawrence, who worked at Bletchley Park during World War II.
The book does a great job to taking a complex, and messy, narrative and shaping it for the reader to understand. It was amusing to read how an obscure, but genius, cryptographer working in a dank room had far reaching consequences on the other side of the world without anyone knowing about it.