The Boxcar Children are excited to be visiting all their favorite animals at Edward Marlow's zoo! But they soon discover someone is mixing up the signs on the cages and putting animals in danger. Can the children catch the culprit and save the animals in time?

For use in schools and libraries only. When the Boxcar children visit a zoo run by a friend of their grandfather, they discover that someone has switched signs around, shut off the electricity, and drained the water from the seal pond.

The Alden children discover a necklace that bears a striking resemblance to their grandmother's necklace, stolen on her first wedding anniversary

Trine knows the answer to any question, except _how_ she knows it. But that’s a mystery for later. The mystery for now concerns frozen mammoths in Siberia, and Trine, who never leaves London, wants to go see them herself. And close behind her is a killer who’s targeted Trine for reasons even she doesn’t know.

The Aldens are starring in The Wizard of Oz—and even Benny and Watch have roles! But as the children get ready to perform, mysterious things start to happen. Can the Boxcar Children find out what's going on and save the show before opening night?

When the Aldens learn about a burglary at an antique store, they set out to find who stole some jewelry. But then the thief strikes again—at their own house! This time, Benny's favorite cereal has been taken! Why would a jewel thief take a cereal box?

The Aldens are going camping! But after they hear loud music in the middle of the night, notice their lantern is missing, and find a frightening note, the Boxcar Children must find out who is behind the pranks to save their vacation.

Boxcar Children #34.

Book three in this fast-paced and exciting series for middle grade fantasy, mystery, and animal buffs. Noah, Megan, Richie, and Ella are the Action Scouts; friends whose tree house overlooks the Clarksville City Zoo. When they discover a magical world hidden within the zoo, they are swept away on an adventure in which penguins can fly, a mysterious figure lurks in the shadows, and the scouts are enlisted to help Mr. Darby, who is in charge of the Secret Zoo. But will the scouts be able to fight against the dangerous sasquatches who have escaped the zoo and threaten their town? There’s only one way to find out if the four friends training as Crossers can help save the Secret Zoo. The author originally had the idea for The Secret Zoo when he was nine and wondered what would happen if zoo exhibits had secret doors that allowed kids to go inside—and the animals to come outside. He brings that sense of adventure and excitement to this story, making it a favorite for home and classroom reading along with such middle grade fantasy favorites as The One and Only Ivan.