The Hardy boys find the missing deed to an Indians' land, prevent a phony salesman from carrying through a reckless scheme, and help their father solve a top-secret case.

"Cursed by an old carnival game, sixth-grader Rex Dexter uses his new ability to communicate with dead animals to investigate the mysterious deaths of endangered zoo animals"--Title verso page.

As more and more of his flowers display the bite marks of a wandering tortoise, Nate sets out to uncover the mystery of the reptile's origins.

"Kayla places her tooth in a Tooth Fairy pillow, but it disappears before the Tooth Fairy has a chance to visit--can her dog King help Kayla find the missing tooth?"--Title verso page.

Teenage detective Nancy Drew uses her courage and powers of deduction to solve the mysterious happenings in an old stone mansion.

Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he investigates such cases as whether a diary of George Washington's mother is authentic, or if a UFO picture supposedly taken by the army is real.

Asks the reader to choose the plot path in a story in which most of a medical team researching tropical diseases goes missing in the Amazon jungle, leaving a young doctor--the reader--alone.

"Amateur sleuths Frank and Joe Hardy investigate a counterfeit operation while their detective father is connected to a secret case involving national security. An old mill on the outskirts of town appears to hold the key to solving both crimes"-- "Amateur sleuths Frank and Joe Hardy investigate a counterfeit operation while their detective father is connected to a secret case involving national security. An old mill on the outskirts of town appears...

The stories illustrate how Frank and Joe Hardy use the various facets of police technology while tracking down criminals. Techniques include fingerprinting, surveillance, and other related skills in the science of criminal investigation.

Leaving behind her life and friends in Florida to move with her family to Chicago isn't exactly Tessa Woodward's idea of a good time. But she finds herself with bigger problems than homesickness when she realizes her new house is haunted. With the help of her three new friends, she'll need to get to the bottom of what happened at her house a hundred years ago so the spirit haunting her can finally rest in peace.