Scholar Jules Addison and scavenger Amelia Radcliffe join forces to unravel secrets of a long-extinct civilization, only to discover something that could spell the end of the human race.

While preparing for a fund-raiser antique show, Trixie and the other members of the Bob-Whites discover a secret code in the pages of an old magazine in the attic.

Dr. One-Zero won't stop until the whole town--no, the whole world--embraces the "true happiness" found in his poisonous potion, Green Pop. And now that he has the Turtle of Light, he's virtually unstoppable. There's one weapon that can defeat him: another Turtle of Light. Unfortunately, they can only be found in another dimension! To open a portal to this new world, Hopper, Eni, and Josh's coding skills will be put to the test.

657 days ago Meg's British father left their home in France to fight the Nazi's, 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...

Twelve-year-old William Wenton is a code-breaking, puzzle-solving genius. He lives with his family in a quiet Norwegian town. He and his family used to live in England, but eight years ago his grandfather vanished and the Wentons suddenly packed up, moved to Norway, and changed their last name! Neither of his parents will tell William why or share the reason he has to keep his talent for solving codes and puzzles a secret. But then a special exhibit...

During World War II, eleven-year-old Felicity is sent from London to Bottlebay, Maine, to live with her grandmother, aunt, uncle, and a reclusive boy who helps her decode mysterious letters that contain the truth about her missing parents.

Nat Turnbull is a history professor who specializes in the German resistance. When his estranged mentor, Gordon Wolfe, is arrested for possession of stolen World War II archives, Nat's hardly surprised that the eighty-four-year-old has gotten himself into trouble. But what's in the archive is staggering. Yet key documents are still missing, and Nat believes Gordon has hidden them. Then Gordon is found dead in jail, and the FBI dispatches Nat to track...

Evil agency Shadow is up to something in the middle of the rainforest. Something that could see them get the jump on SHINE. Special Agent EJ12 needs to leap into action. She must crack Shadow's codes and foil their plan and save the rain forest. That's the easy part. As EJ12, Emma Jacks can do anything. So why is the state gymnastics meet so hard? Perhaps it isn't after all.

Second-grader Sam Graham wants a cell phone to do research and share information but when his parents say no, he devises a new plan that starts a fad at school.