ciphers

Sarah and Aidan begin to decipher a mysterious document that refers to the origins of Peter Pan and are suddenly pursued by a being that can take any form and will stop at nothing to get what it wants from them.

This activity book is filled to the brim with exciting activities for Nate fans of all ages. There is plenty of space for kids to get creative, and all the favorite characters from Nate's world are included--the know-it-all Gina, Nate's best buddies, Francis and Teddy, his rival, Artur, and his least favorite teacher, Mrs. Godfrey, aka Godzilla. With personality pop quizzes (which Big Nate character are you most like?), the fabulous fun 'o' meter, cosmic cookie fortunes, create your own comix, the "honor roll or not?" amazing maze, rock and roll rhymin', knockout knock-knock jokes, and much more, Nate's world pops off the pages with more than 500 black-and-white illustrations that you get to help create!.

"An enigmatic message leads the Code Busters on a treasure hunt on creepy Alcatraz Island, where they must use their problem-solving skills to unravel the mystery"--.

Chronicles the first Vesper attack on Jan van Eyck's altarpiece at Ghent in the 1600s, then jumps to World War Two and young Grace Cahill's desperate bid to save the masterwork from the Nazis.

Discusses the difference between codes and ciphers, examines common codes and ciphers that have been used during wars, and explains how to create simple ciphers.

An illustrated introduction to cryptography and ciphers that discusses the history of codes, code breaking technology, the Code Talkers, and the ways codes are used during the early twenty-first century.

Sly uses her detective skills to help her friends solve mysteries that all involve some kind of code.

Adam, Finn, Lewis, and Emily use their computer coding skills and high-tech equipment to catch criminals, but when they begin to track Shantorian, a dangerous hacker, things do not play out as easily as the four Trackers predict. Includes passwords for Web content.

When a new book arrives at the library with a secret code written inside, Derek, with the help of his friends, follows the clues from one novel to the next and makes a discovery that may help him get past a terrible loss.