The Bletchley riddle / Sepetys, Ruta

Follows siblings Jakob Novis and his quirky younger sister Lizzie as they find themselves at Bletchley Park, the home of WWII codebreakers working to decrypt the Nazi's Enigma cipher, where the two struggle to unravel a mystery surrounding their mother's disappearance against the backdrop of the Battle of Britain and Hitler's feared invasion.

In the summer of 1940, siblings Jakob and Lizzie Novis find themselves at Bletchley Park, where Jakob works to crack Nazi codes while Lizzie investigates the mysterious disappearance of their mother, only to discover that the two mysteries are intertwined.