The Alden children are searching for a rare comic book of their favorite superhero, Captain Fantastic. They finally find the comic and something else, too--a strange note inside, signed by the comics creator. The Aldens realize the note is a fake.

The Alden children help out at the Greenfield Ice Cream Barn and while learning to make ice cream and create new flavors, they help solve a mystery before the Barn gets shut down.

The Aldens are joining Dr. Iris Perez as she investigates legendary creatures around the world. In the last leg of the journey, the children travel to the Amazon Rain Forest. They love learning about all the different plants and animals they have never seen before. But is there really a creature in the forest that hasn't yet been discovered?

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 Boxcar Children know how much work it takes to live in the wilderness. They also know how much fun it can be! The children love exploring and learning new things at a primitive skills summer camp. But when strange things start happening around the camp, they need to use another of their favorite skills--mystery solving!

The four Alden children, aged six to fourteen, uncover a mystery while volunteering at a food pantry for the needy.

The Aldens' boxcar is the perfect place for games, picnics, sleepovers, and fun, but when strange things start happening there, Benny is convinced that the boxcar is haunted.

While canoeing and backpacking near Timberwolf Lake, the Aldens receive strange warnings to stay away from the area and stumble upon clues to a missing cache of stolen coins.

"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?" -- p. [4] of cover.

The Boxcar children investigate the disappearance of a student's research paper from an observatory, and the subsequent disappearance of another student.