Gertrude Warner: 149 books

While visiting Pikesville, New York, the Boxcar Children join the exciting last games of the season in a strange old ballpark. The Pikesville Half Moons are playing the Eagles, but the Eagles seem to be hitting far too many home runs.

A photograph of the statue of a Revolutionary War hero contains a secret message.

The Aldens are exploring underground caves! But when their trail markers are stolen, how will they find their way out?

A double puzzle involves an old friend of Aunt Jane's, romance, and a chase.

Benny and his friend Mike are in trouble when they are curious about a uranium mine.

A children's classic now available in Spanish. Henry, Jessie, Violet, and Benny Alden are brothers and sisters—and they're orphans! The only way they can stay together is to make it on their own. One night, during a storm, the children find an old red boxcar that keeps them warm and safe. They decide...

The Aldens are down south in Louisiana bayou country, visiting an area that has come to be known as Alligator Swamp. They're enjoying their time, but something odd is going on. Could it be the ghost of Gator Ann—a long dead alligator—has come back?

The Aldens are excited to meet their favorite celebrity—Walter the Cat, who makes the funniest videos on the Internet! And when this celebrity cat inherits a million dollars from his owner, he becomes even more famous! But someone seems to be angry about the will and is stealing things from Walter’s house. Is this cat too famous for his own good?

When a new dog obedience business opens in Greenfield, the Aldens decide to enroll Watch for a refresher course. At the first class a Dalmatian goes missing, and everyone wonders if the dog ran away or was stolen. But when a malamute disappears at the second class, Henry, Jessie, Violet, and Benny...

Henry, Jessie, Violet, and Benny Alden are brothers and sisters—and they're orphans! The only way they can stay together is to make it on their own. One night, during a storm, the children find an old red boxcar that keeps them warm and safe. They decide to make it their home. This set includes...

The Boxcar children are attending an Invention Convention at the home of an eccentric artist known for her one-of-a-kind clocks. The clocks sound loudly at every hour. But the clocks aren't the only noise the kids hear at midnight.

The Alden's neighbor, Lina, thinks there's treasure hidden in her attic and she wants the Boxcar Children to help her find it. Of course, the children are eager to help search—but it appears they aren't the only ones looking for the treasure.

Many complications follow when a dog attaches himself to the Aldens on a bicycle trip.

Henry and Jessie's middle school robotics team is going to the regional competition! But it seems like someone doesn't want their team to compete. Can the Aldens use their sleuthing skills and what they've learned about robotics to find the culprit and save the day?