The Aldens investigate a mystery involving a legendary mining expedition to the gold fields of Alaska.

The Aldens participate in a three-day bicycle ride and soon find that someone seems to be intent on keeping others from completing the event.

The Aldens help a farmer whose honeybees have stopped producing honey and discover a sabotage scheme.

The Aldens, while testing the latest version of their favorite computer game, are surprised to find messages directed specifically at them.

While visiting the Outer Banks of North Carolina, the Aldens see a mysterious wild horse that may be a ghost.

A series of practical jokes at a restored nineteenth-century farmhouse makes the Aldens wonder if the ghost of its builder is at work.

The Aldens accompany their grandfather to his class reunion at Goldwin University, and investigate the possibility of a buried Civil War treasure, and a ghost in the bell tower.

While visiting a small town in Alabama, the Aldens hear mysterious howls at midnight, leading them to wonder if an old local legend about a ghost dog is true.

While visiting an old mansion, the Aldens investigate the possibility that it may be haunted.

The Aldens are spending a week at Camp Seagull on beautiful Claw Island. But as soon as camp begins, they realize that someone is not playing fair. Everything begins to go wrong for the Aldens they lose their luggage, Henry misplaces the camp flag, and the campers on the other team use one of Jessies ideas to score points for themselves. Are some campers so desperate to win the Olympics that they are willing to cheat? The Boxcar Children are...