NEW YORK TIMES BESTSELLER • A thrilling mystery and collaboration between award-winning and
bestselling authors Ruta Sepetys and Steve Sheinkin! This historical adventure follows two
siblings at Bletchley Park the home of WWII codebreakers as they try to unravel a mystery
surrounding their mother’s disappearance. "Break out your Enigma machines! Sepetys and
Sheinkin have written a thrilling World War II code-breaking adventure filled with ciphers
secrets and spies."—Alan Gratz New York Times bestselling author of Refugee Remember you
are bound by the Official Secrets Act… Summer 1940. Nineteen-year-old Jakob Novis and his
quirky younger sister Lizzie share a love of riddles and puzzles. And now they’re living
inside of one. The quarrelsome siblings find themselves amid one of the greatest secrets of
World War II—Britain’s eccentric codebreaking factory at Bletchley Park. As Jakob joins
Bletchley’s top minds to crack the Nazi's Enigma cipher fourteen-year-old Lizzie embarks on a
mission to solve the mysterious disappearance of their mother. The Battle of Britain rages and
Hitler’s invasion creeps closer. And at the same time baffling messages and codes arrive on
their doorstep while a menacing inspector lurks outside the gates of the Bletchley mansion. Are
the messages truly for them or are they a trap? Could the riddles of Enigma and their mother's
disappearance be somehow connected? Jakob and Lizzie must find a way to work together as they
race to decipher clues that unravel a shocking puzzle that presents the ultimate challenge: How
long must a secret be kept?
