Steve Sheinkin

The cross-continental race to build the atomic bomb.

--- Added from Google Books ---

Discusses the international competition to create the first atomic bomb.

Jump back to the summer of 1940, when the world was full of secrets and spies! Meet Jakob, a super smart math whiz, and his clever younger sister, Lizzie. These two love solving riddles, and now they are in the middle of a huge puzzle. Jakob has been called to a top-secret place called Bletchley Park, where he works to crack hidden codes used by enemies. But Lizzie has her own secret mission: she's determined to find their missing mother. With confusing messages arriving and a suspicious inspector lurking, Jakob and Lizzie must put their heads together. Can they use their amazing puzzle-solving skills to unlock clues, uncover mysteries, and find their mother, all while keeping the biggest secret of all? Get ready for a thrilling adventure filled with codes, bravery, and the excitement of unraveling big puzzles!