mystery fiction

At the same time that the Alden children's efforts to raise money for a new hospital wing are being sabotaged by nasty tricks, they find their attempts to befriend the new girl, Beth, frustrated by her strange behavior.

The Alden children have another mystery to solve when they visit a castle and must figure out which of the guests has stolen the Stradivarius violin.

The Alden children, isolated in a storm at a small bus station, are led into a mystery centering on a polluted river.

The Aldens search for carousel horses that have disappeared from an amusement park.

Nancy, helping out with a "chemystery" camp, a special forensics program for high school students, finds herself with a real mystery to solve when the professor who runs the camp suddenly falls into an unexplained coma.

While staying at an eighteenth-century inn in Vermont, the Boxcar children become curious about the mysterious "accidents" that keep plaguing the owners.

A friendly writer with a metal detector, the mysterious inhabitants of a tower house, and the discovery of a locket in the sand are ingredients for the Aldens' latest mystery.

Fourth-graders Drake Doyle and Nell Fossey combine their detective and scientific investigation skills to solve a variety of cases, involving a noisy garbage can, endangered frogs, a stuck truck, and a mysterious love letter.

Fourth-graders Drake Doyle and Nell Fossey combine their detective and scientific investigation skills to solve cases involving a crooked carnival barker, a mysterious ghost, an alien plant species invading wildlife habitats, and a wobbly bridge.

Fifth graders Drake Doyle and Nell Fossey use their detective and scientific investigation skills to solve cases which involve food poisoning, missing terns, a haunted treehouse, and a pig in a pit.