It started with a kidnapping. A shadowy organization known only as the Vespers snatched seven members of the Cahill family and demanded a series of bizarre ransoms from around the world. Thirteen-year-old Dan Cahill and his older sister Amy began a global treasure hunt, determined to bring back whatever Vesper One needed, so long as it kept the hostages safe. But when they deliver the last ransom, Amy and Dan discover Vesper One's terrifying endgame....

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

"Elusive art thief Lars Heinrich returns to New York City looking to settle a score. Super sleuth seventh-grader Edmund Xavier Lonrrot will need not only his photographic mind and artistic talents, but any skill he possesses with cracking codes as a string of the city's historical monuments become potential clues in what could become one of the greatest heists in history"--

12 monkeys: A lone time traveller from the year 2035 must solve a riddle that may save his people ... but it may also take him to the brink of madness. Mercury rising: Art Jefferies, a renegade FBI agent, combats ruthless Federal agents to protect Simon, a nine-year-old autistic boy who has cracked the govrenment's new "unbreakable" code. The jackal: A ruthless assassin has been hired to emiminate someone at the very top of the U.S. govrnment. Constantly...

"Amid assignments that take the Explorer Academy recruits from the iceberg-filled waters of Antarctica to the bone-dry deserts of Argentina, Cruz Coronado is scrambling to complete the last piece of the cipher. With Nebula agents and the elusive explorer spy still out there, his opportunity to recover his mother's world-changing formula is slipping away. But as Cruz has learned from his time aboard Orion, true explorers must never give up. Even after...

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.

When Cody's younger sister disappears in Magicland, it is up to the Code Busters to solve puzzles and messages to find her. Back matter includes keys to the codes and solutions to the coded messages that appear throughout the text.

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...

Because John is afraid to leave the Navajo Reservation, his grandfather explains to him how the Navajo language, faith, and ingenuity helped win World War II.

Unexpected media attention in their Harlem neighborhood bring Shelby Holmes, nine, and John Watson, eleven, a new case that sends them undercover as figure skaters.