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.

A young Canadian visitor helps the Alden family solve a mystery involving a lost coin collection.

While on bicycle trip to their aunt's farm, the four Aldens help solve a mystery.

Because they do not want to be separated, four orphaned children run away and live in an old abandoned boxcar

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...

Renting a lighthouse is unusual, but even more so is an unfriendly boy's peculiar behavior.