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

Nancy Drew sets out to prove that her father's client was unjustly accused of trying to sabotage the United States space program.

A collection of Sherlock Holmes mystery adventures, including ""A Scandal in Bohemia,"" ""The Red-headed League,"" and ""The Adventure of the Speckled Band.""

Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he locates stolen jewels, retrieves a stuffed tiger, and more. Solutions are included at the back of the book.

Nancy Drew, the teen detective, and her friend, Ned Nickerson, find a pirate chest filled with gold coins in the hold of an old showboat.

The Hardy brothers' visiting Greek pen pal enlists their help in searching for a priceless ancient Greek helmet loaned to and lost by a Hollywood movie company years before.

The Hardy boys dial a wrong number, get the Pentagon, and suddenly find themselves in a dangerous adventure involving national security.

When their detective father asks them to play burglar in order to protect a client's valuable invention from thieves, the Hardy boys find themselves involved in a large and dangerous conspiracy.

When thirteen-year-old Logan and his family move into a run-down old house in rural Virginia, he discovers that a woman was murdered there and becomes involved with his neighbor Arthur in a dangerous investigation to try to uncover the killer.

Left alone when Rush, Mark, and Mona go away to boarding school, Randy and Oliver are lonely and bored until a mysterious letter brings the first of many clues to a mystery that takes all winter to solve.