Gertrude Warner: 149 books

The Alden children knew they would be investigating a mystery at Eton Place, but they had no idea there would be a ghost there, too! An old family friend, Norah Eton, believes there is a valuable piece of jewelry hidden somewhere on her property.

The Aldens visit Cap Lambert near Hannibal, Missouri.

Cousin Alice is running for mayor in her town, and the Aldens are helping with her campaign! But Alice's campaign posters are torn down and painted over—and the same thing happens to her opponent! Then posters for a third candidate appear around town, but nobody has ever seen him in person. Will the town elect a mystery man for mayor? The Aldens are on the case!

A trip in a caboose at the end of a freight train leads to an old clown and a search.

It's a delicious new mystery with the Boxcar Children as they help catch a cupcake thief! Mama Tova's shop in Greenfield is so famous that every day, people line up around the block to buy her cupcakes. But when someone breaks into her kitchen, it's clear that her secret recipe is in danger. The Aldens...

Jessie and Violet are selected to play on the local baseball team, Henry gets a job helping the coach, and even Benny has a special role—as batboy. But at this ballpark, there's more than just a game going on—there's a mystery.

A children's classic now available in Spanish. Henry, Jessie, Violet, and Benny Alden have just found out they have an Aunt Jane who hasn't spoken to their grandfather in years. The children are spending the summer on Aunt Jane's ranch out west. On the way there, the girls spy a "mystery man."...

Is someone trying to ruin the winter games at Snow Haven Lodge? Skis go missing and then Benny’s snow people are smashed! It’s up to the Aldens to find the culprit.

The Aldens learn that their housekeeper has to sell her childhood home, the Crooked House, because she cannot afford to keep it. The Aldens learn that there is a riddle surrounding the house, and if the can solve it, there might be a treasure to be found!

Someone steals artifacts from a Navajo reservation.

The Aldens are visiting a real dinosaur dig in Montana, in an area full of fossils and caves! But the bones of a rare dinosaur have gone missing, and when the children begin to search for clues they hear strange noises in the caves and discover mysterious tracks! Why are bones disappearing? And could there be a real-life dinosaur on the loose?

The Aldens are visiting Aunt Jane when a nearby house burns down. Their friend Mike is blamed for starting the fire! Can the Aldens help find the real criminal? This set includes both the English and Spanish version of the story. SPANISH DESCRIPTION Los Aldens están visitando a Tía...

A children's classic now available in Spanish. Henry, Jessie, Violet, and Benny Alden discover that a mystery surrounds the run-down yellow house on Surprise Island. The children find a letter and other clues that could lead them on the trail of a man who vanished from the house. SPANISH DESCRIPTION Una...

When the Aldens go to dinner at a local Chinese restaurant, Benny can't wait for his favorite part of the meal--dessert. But when Benny opens his cookie, instead of a fortune, he finds a handwritten riddle!