The Alden children find what appears to be a Native American mask in a trash can and set out to learn its significance--and catch a thief--after it is stolen.

The Alden children travel on a Mississippi paddle-wheel steamer to visit an old family friend in his cabin near Hannibal, Missouri, and try to discover who is responsible for the mysterious activities near the house.

Six children help solve the mystery of a missing spyglass that has kept two brothers feuding for years.

"The Aldens are visiting Port Elizabeth when a bad storm rolls in, knocking out the power--and leaving behind a mystery! Can the powered-down Aldens figure out what's going on?"--Page [4] of cover.

While staying at the Winding River Lodge, the Alden siblings investigate tales of a zombie haunting a lake in the woods.

Taking a shortcut through the Greenfield Cemetery, the Aldens stumble across a local superstition which maintains that visitors are required to leave gifts or suffer the wrath of a malevolent ghost, a suspicious tradition that prompts the children to expose the truth.

The Aldens are helping the owner of a local restaurant grow delicious food in a garden. They work hard to water and weed and take care of the fruits and vegetables that are growing. But soon the children notice the strangest thing--the plants are moving. The tomato plants aren't in the same spot they were planted in How could that be happening? Then, when fruits and vegetables start to vanish from the garden, it's clear that a brand new mystery is...

The Boxcar Children investigate a mystery about a rundown yellow house on Surprise Island and the man who disappeared from it.