When a gang that uses parties as a cover for robberies victimizes a masquerade party Nancy is attending, the teen-age detective switches identity

Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he locates stolen jewels, retrieves a stuff

Nate the Great interrupts his backyard vacation to find his friend's lost grocery list--before lunch.

The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine

After a dying criminal confesses that his loot has been stashed "in the tower, " the Hardy boys make an astonishing discovery.

Nancy and her friends find they have to overcome people's superstitions and fears in solving the case of a "jinxed" and threatened bird farm.

After a dog she is watching disappears from a city parade and the owner receives a ransom note, thirteen-year-old Sammy must use her detective sk

Rob admits having seen a murder, but no one believes him--except the murderer.

When one of them finds a successful way to communicate with a live person, four young ghost decide to band together to help solve and prevent cri

Rob admits having seen a murder, but no one believes him--except the murderer.

The town's ten-year-old walking encyclopedia again solves ten neighborhood mysteries. The final solutions to the cases are at the back of the boo

Becky and her brother use some ingenious clues to identify the person who stole five children's books from the town's library.