Nancy receives a letter meant for a British heiress who has the same name and, in her attempts to contact the other young woman, faces danger from a man who operates a Lonely Hearts Club mail fraud.

The young sleuth searches for a treasure hidden in a city now buried under the Nevada desert.

Nancy arrives in Phoenix, Arizona, eagerly looking forward to a fun-filled vacation at Shadow Ranch, but finds herself embroiled in a baffling mystery involving a phantom horse and buried treasure.

When Nancy Drew and her friends arrive at Misty Lake, they meet pretty, red-haired Cecily Curtis, who seeks Nancy’s help in solving two mysteries. One concerns Cecily’s fiancé, Niko Van Dyke, a popular singer who believes that his record company is cheating him of royalty payments. The other invovles a family treasure hidden before the start of the Civil War; Cecily’s only clue is half of a gold locket. Nancy’s investigations lead her to...

While traveling on the train to San Francisco with his cousin Olivia's owl, Nate the Great and his dog Sludge must use all of their detective skills when the owl suddenly disappears.

Nancy and her friends, Bess and George, meet Joanne Byrd on a train ride home. Joanne lives at Red Gate Farm with her grandmother, but if they do not raise enough money to pay the mortgage, they will soon lose the farm! Nancy, Bess, and George decide to stay at Red Gate for a week as paying customers. Soon, they learn about the strange group of people who rent a cave on the property. They describe themselves as a nature cult called the Black Snake...

As almost thirteen-year-old Ben, a student at the CIA's academy for future intelligence agents, prepares to go to spy summer camp, he receives a death threat from the evil organization SPYDER.

"Mr. Lemoncello holds a contest for his young friends where they must race to bring interesting facts back to his library" -- "Everyone's favorite game maker, Mr. Lemoncello, is testing out his new Fabulous Fact-Finding Frenzy game! If Kyle can make it through the first round, he and the other lucky finalists will go on a great race--by bicycle, bookmobile, and even Mr. Lemoncello's corporate banana jet!--to find fascinating facts about famous Americans....

The Sinister-Winterbottoms, twins Alexander and Theo and their older sister Wil, find themselves at a mysterious summer camp where they meet other families whose parents are missing.

Andy and Terry live in a 52-story treehouse (it used to be a 39 story treehouse, but they keep expanding). It has a chainsaw-juggling level, a make-your-own-pizza parlor, a rocket-powered carrot-launcher, a life-size snakes and ladders game, a remembering booth, a Ninja Snail Training Academy and a high-tech detective agency, with all the latest high-tech detective technology. Something that is sure to come in handy as they try to solve the mystery...