When the Smithfork family moves into a lavish Manhattan apartment building, they discover clues to a decades-old mystery hidden behind the walls

While staying at a London inn, the Aldens are puzzled by the peculiar behavior of two fellow guests, a mysterious stranger who follows them, and

While helping their grandfather prepare for Greenfield's Winter Festival, the Alden children uncover a mystery surrounding the statue in the town

While sightseeing in San Francisco, the Boxcar children uncover a mystery involving fishing boats and sabotage.

Xena and Xander Holmes, an American brother and sister spending a year in England, use clues in their ancestor Sherlock Holmes' casebook as they

While sightseeing at the Alamo, the Boxcar children investigate the disappearance of a priceless ring from the Alamo museum.

Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and anima

Puzzle-crazy, twelve-year-old Winston and his ten-year-old sister Katie find themselves involved in a dangerous mystery involving a hidden ring.

Four orphaned children run away and live in a boxcar, until they are found by their grandfather. Includes a biography and photographs of the auth

Tandy Angel is, along with her brothers, a suspect in their parents' murder but having grown up under Malcolm and Maud Angel's perfectionist dema

While exploring the caves around Dragon's Mouth Cavern, a series of unusual and somewhat frightening events convinces the Alden children that som

The Aldens investigate when a new store called the Game Spot opens in town and the neighboring shops are robbed.