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Twelve-year-old Dylan Fisher is a treasure hunter, and the creek behind his house has plenty of it. He hits the jackpot when he finds a geocache containing a cool crystal rock, and he meets the new girl next door. Both seem special, but both have a secret. When a corrupt eco-company steals the crystal and puts his new friend in danger, Dylan finds himself in the middle of a rescue mission. Through geocaching, he must solve encrypted codes, secure...

"When agoraphobic genius Salem Wiley lands her dream job as an FBI cryptanalyst, she vows never to return to the witch hunt underworld, where ancient secrets encrypted by hunted women have the power to rewrite history. Her resolve disappears when sweet Mercy Mayfair, the child she is pledged to protect, is kidnapped. With the help of the enigmatic Agent Lucan Stone, Salem is forced to code hunt in Ireland, England, and Scotland to keep the girl alive....

The explosive finale to the #1 bestselling series!

Fourteen-year-old Amy Cahill and her younger brother, Dan, have had enough. Not only do they have to find the 39 Clues first, they're expected to reunite their backstabbing family - the same people who killed their parents. But Amy and Dan haven't survived explosions and assassination attempts for nothing. They have a plan to finish the Clue hutn on their own terms. Too bad there's a final,...

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.

Crack the code with Carmen Sandiego! In this original story inspired by the Netflix animated series, a special clue-decoding wheel built right into the front cover allows readers to hunt for long-lost pirate's treasure alongside the world's greatest thief.

As Cruz and his friends continue to search for the third piece of the cipher, a mysterious message arrives suggesting that someone close to him is working for Nebula, leaving Cruz unsure of who he can trust.

Mr. Summerling, Marly's neighbor, talked about being a treasure hunter, and news of his death has brought Marly into a treasure hunt of her own. In his will, Mr. Summerling left a treasure for Marly and two classmates, Isla and Sai. They barely know each other, but they have to work together with a series of riddles, puzzles, and clues to find the treasure.

Thirteen-year-olds Bertie Bradshaw of London and American Eleanor Shea team up to decipher a coded notebook and stop a double agent from revealing secrets about the upcoming D-Day invasion.

Charlie Thorne, along with former agents Dante Garcia and Milana Moon, race to find an immensely powerful discovery of Isaac Newton's and face challenges and enemies along the way. Charlie Thorne is a genius. Charlie Thorne is fearless. Charlie Thorne may have finally met her match. Charlie Thorne is used to being on the run. Ever since she was recruited by the CIA to track down Einstein's most dangerous equation, Charlie - and former CIA agents...