ciphers

"On an island nation in the Indian Ocean, the explorers venture through a vast underwater world and take part in a friendly robotics competition. But the tides of good fortune change quickly. Suddenly, Team Cousteau jumps into action to rescue a faculty member from the brink of death. Meanwhile, the team follows the Cruz's mother's clues to a magnificent tomb and center of spirituality precariously perched on the side of a cliff. There, Cruz is confronted by a familiar foe who's determined to stop him from completing his most important mission of all: Retrieving the final pieces of his mother's cipher. In this life-or-death showdown, Cruz witnesses the ultimate sacrifice and uncovers a hidden message that makes him question his own mortality"--Publisher.

Akiko, Mae, and Josie, also called the Infinity Trinity, spring into action after learning that a spy is betraying secrets to the Japanese military--and that Akiko's mother may be involved.

"Marly, Sai, and Isla are back on the hunt. After finding Mr. Summerling's hidden treehouse, they've discovered a new set of clues for them to follow, leading them straight to the heart of their mysterious neighbor's life: his house. The same house Marly has been living next to all of these years, which, they discover, is filled with hidden rooms and staircases. With just a few scraps of papers as clues, and Mr. Summerling's angry son on their tails, can the Treasure Troop find the answers they're looking for?"--OCLC.

Logan tells Quinn that he likes breaking codes so she gives him a coded message. In truth, Logan isn't a code breaker and now he has to find a way to break the code or admit the truth.

"Chris and Carrie have been betrayed. Maddison has discovered the dark secret in her father's past. A cold case is suddenly hot and has changed from 'missing' to 'murder.' As a crime wave hists Archer's Grove and authorities struggle to catch the culprits, Chris, Carrie, and Maddison turn to the Kinsolvers' Aunt Elsie for answers. Can the notebooks she left behind illuminate this tangled web of lies, betrayals, and broken promises? Will the truth finally be uncovered?"--Proved by publisher.

Twelve-year-old Addison Cook and his friends are on the hunt for a long-lost treasure. They'll need to outwit a band of thieves, survive booby traps, crocodiles, and a Russian assassin--to name a few of the obstacles standing in their way--in order to secure the three keys needed to unlock the ancient treasure.

Twelve-year-olds Ambrose, Tom, and Frankie are transported to the boys' hometown of Freedom Falls, Ohio, in 1852 when Frankie blows her Romani family's magical trombone, and to return home they will have to use both Morse code and the ancient form of divination known as the I-Ching.

Akiko, Mae, and Josie, also called the Infinity Trinity, spring into action after learning that a spy is betraying secrets to the Japanese military--and that Akiko's mother may be involved.

In 1666, after four months away, friends Christopher Rowe, Tom, and Sally return to London triumphantly but, guided by coded riddles, face a conspiracy that threatens Christopher, as well as the King himself.

657 days ago Meg's British father left their home in France to fight the Nazis, leaving some codes in a jar for her to decipher, and Meg and her French mother moved to the Perche, a region in France near Normandy known for its forests; now Meg watches the German soldiers in town, and sometimes carries messages for the French resistance--but suddenly things have gotten much more dangerous: there is a wounded British officer hiding in her grandmother's barn, a family of German refugees who are trying to get to Spain, and the Nazis have arrived on the doorstop searching for the fugitives.