While helping run Jerry Taylor's general store, the Alden children investigate his mysterious employee Nancy.

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

While on a cruise with their grandfather, the Alden children help discover who is behind the mysterious troubles of the ship--disconnected phone lines, engine trouble, a man overboard--and still have fun sightseeing, eating, and swimming.

The Alden children suspect that the other guests are somehow involved when things begin to disappear at the bed and breakfast where they are staying in Washington, D.C.

"The Aldens are camping on Padre Island National Seashore, which is known for a rare type of sea turtle. But someone on the island is putting the animals at risk!"--Back cover.

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 Alden kids investigate a series of break-ins and vandalization at the local recycling center, where Mrs. MacGregor has recently shown them they can find a lot of great things.

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 Aldens try to find the thief who stole a very rare teddy bear from the toy hospital at the teddy bear festival.

The Aldens help out at a minor league stadium and investigate when it appears someone in the ballpark is stealing the home team pitcher's signals and relaying them to the batters of the other team.