In the third book of the Asha and Baz series, readers travel to the past to learn about codebreaking during Word War II! When Asha and Baz get stuck on a codebreaking challenge at school, they travel to 1942 to find help. Codebreaker Elizebeth Friedman seems like just the person for the job--but first, the kids must help her decode some secret messages from Nazi spies! How will Asha, Baz, and Elizebeth crack the code and save the Queen Mary? Themes: children's books on STEM/STEAM, Early reader, women in science, women in history, space, gender equality. Science activity in book can be replicated in schools or at home using simple supplies. Instructions provided in story.