ciphers

Siblings Dan and Amy Cahill have managed to avert one disaster recreation threatened by the man who calls himself the Outcast, but they have mere days to learn where the Outcast will strike next. The clues are pointing them toward a terrifying air disaster so they naturally think of the Hindenburg disaster, but how can that be the target when nobody in the present day travels by airship?.

An intruder at mad scientist's Petty Potts' house interrupts her latest experiment, trying REPTOSWITCH on twins Josh and Danny, and when they return home they find a package that sends them on a mysterious quest.

Twins Danny and Josh reveal to neighbor Petty Potts that they have been on a quest to find marbles containing secret code and soon find themselves--as geckos--in her new secret laboratory within the very pink Princessland.

This book explores the life of Alan Turing, the man regarded as the father of computer science and artificial intelligence. Readers will discover the fascinating facts of Turing’s exciting code breaking career during World War II, which helped the Allies win many important battles. The text includes details about his designs for one of the first computers, and how his work laid the foundation for other computer pioneers.

Amy and Dan must find the Outcast before he causes a nuclear meltdown.

"A trip to a museum to learn about ancient Egypt turns into a new case for the Code Busters when they discover that someone may be stealing artifacts and replacing them with cunning forgeries"--Provided by publisher.

During a class trip to Washington, D.C., the Code Busters have many opportunities to hone their sleuthing skills as they explore the International Spy Museum, the White House, and more, but when a classmate goes missing, a mysterious figure in a trench coat may be the key to solving the case.

When Iranian-American Kamran Smith learns that his big brother, Darius, has been labelled a terrorist, he sets out to piece together the codes and clues that will save his brother's life and his country from a deadly terrorist attack.

Presents a variety of codes and ciphers and includes messages to encode and decode, as part of a story.