• New York Times;Bestseller * Five starred reviews; *;#1 Indie Next Pick * ALA Notable Book This thrilling WWII mystery--a collaboration between award-winning and bestselling authors Ruta Sepetys and Steve Sheinkin--is now in paperback! 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?<

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Ruta Sepetys (rutasepetys.com) is an internationally acclaimed, #1 New York Times bestselling author of historical fiction published in over sixty countries and forty languages. Her novels Between Shades of Gray, Out of the Easy, Salt to the Sea, The Fountains of Silence, and I Must Betray You have won or been shortlisted for more than forty book prizes, and are included on more than sixty state award lists. Between Shades of Gray was adapted into a graphic novel, and the film Ashes in the Snow, and her other novels are currently in development for TV and film. She is also the author of You: The Story. A Winner of the Carnegie Medal, Ruta is passionate about the power of history and literature to foster global awareness and connectivity. She has presented to NATO, to the European Parliament, in the United States Capitol, and at embassies worldwide. Ruta was born and raised in Michigan and now lives with her family in Nashville, Tennessee. Follow her on Twitter and Instagram @RutaSepetys, and on Facebook at facebook.com/RutaSepetys

Steve Sheinkin is the acclaimed author of fast-paced, cinematic nonfiction histories, including Impossible Escape, Fallout, Undefeated, Born to Fly, The Port Chicago 50, and Bomb. His accolades include a Newbery Honor, three Boston Globe–Horn Book Awards, a Sibert Medal and Honor, and three National Book Award finalist honors. He lives in Saratoga Springs, New York, with his wife and two children. He can be found online at SteveSheinkin.com. Follow him on Twitter @SteveSheinkin and on Facebook at facebook.com/Steve.Sheinkin.

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**NEW YORK TIMES BESTSELLER • This thrilling WWII mystery—a collaboration between award-winning and bestselling authors Ruta Sepetys and Steve Sheinkin—is now in paperback!

"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

Five starred reviews • ALA Notable Book
**
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?