The Bletchley Riddle

The summer of 1940 plunges nineteen-year-old Jakob Novis and his younger sister, Lizzie, into a mystery unlike any puzzle they've ever faced. The bickering siblings, who both love riddles and codes, suddenly find themselves at the heart of one of World War II's greatest secrets - Britain's codebreaking operation at Bletchley Park. While Jakob joins the brilliant minds working to crack the Nazis' Enigma cipher, fourteen-year-old Lizzie sets out to uncover the truth behind their mother's mysterious disappearance.

As the Battle of Britain rages and the threat of Hitler's invasion grows, strange coded messages begin arriving at their door, and a menacing inspector watches from outside the gates of Bletchley Park. Are the messages meant for Jakob and Lizzie, or are they part of a dangerous trap? And could the secrets of Enigma somehow be linked to their missing mother? To solve the mystery, the siblings must put aside their differences and decipher a trail of clues that leads to one final question: How long must a secret be kept?