The entire town of Yellow Sands is left puzzled by a mysterious fire.

"Years ago, a man disappeared from the yellow house on Surprise Island. Why? The Aldens have found a clue to the mystery! Adapted from Gertrude Chandler Warner's story of the same name, this new version introduces young readers to a Boxcar Children classic." -- (Source of summary not specified)

Los hermanos Alden pasan las vacaciones de verano en su propia isla privada. Allí conocen a un misterioso nuevo amigo, ¡con un fascinante secreto! --Page 4 of cover. The children are spending the summer on their own private island but there is a mysterious stranger on the island.

Henry, Jessie, Violet, and Benny have never been to a drive-in movie theater before, but they_re visiting a friend who owns one. The children love to eat popcorn in the car and watch movies under the stars. But strange pranks are disrupting the fun_one night the sound system starts playing loud music during the movie, and a couple of the theater employees seem to be hiding a secret. Then, late at night, a ghost is seen walking around the empty grounds...

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, isolated in a storm at a small bus station, are led into a mystery centering on a polluted river.

Four orphans take shelter in an old boxcar during a storm, and, determined to make it their own, they turn it into a safe, cozy home.

"One day in the park, the Aldens' dog, Watch, comes across a mysterious box with a note inside. 'Congratulations!' the note says. 'You've found it!' The box is part of a game called Geocaching. Soon, Henry, Jessie, Violet, and Benny are searching all over town for hidden boxes and making friends with other kids in the geocaching club. But is one of the club members a thief?"--Page 4 of cover.

While visiting Michigan's Upper Peninsula to prepare their Great-aunt Sophie's big old house for sale, the Boxcar Children encounter a mystery involving a valuable ring supposedly hidden somewhere in the house.

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