The Earth Day Fair is days away, but Nate's classroom project - a robot named Mr. Butler - has disappeared. Nate the Great and his dog, Sludge, take on the unusual case, and they are soon searching high and low in and around the school. Will Nate find the robot in time for the fair?

This collection of wonderful stories read by John Lavelle and penned by Marjorie Weinman Sharmat will find a place on any Nate the Great fan's bookshelf.

Meet Olivia Sharp. She's bold. She's eager to help people. She's a special kind of detective. She's an agent for secrets. Duncan is Olivia's first case. He believes that the world is coming to an end. And he wants her help. So Olivia puts on her feather boa. Her driver brings the limo. Soon enough, Olivia knows just what to do. But how will 50 pizzas make Duncan happy?

A Civil War sword, a watermelon stabbing, missing roller skates, a trapeze artist's inheritance and an eyewitness who's legally blind! Encyclopedia Brown must solve cases by using his famous computer-like brain. Try to crack the cases along with him!

In Dinosaurs Before Dark, adventure is waiting to happen! Jack and his younger sister, Annie, stumble upon a tree house filled with books. Where did the tree house come from? How long has it been there? When Jack reads a book about the Cretaceous period, 65 million years ago, and wishes he could really see the pteranodon, it suddenly appears at his window. Magically. Before Jack and Annie can figure out the mystery, the tree house whisks them back to the prehistoric past.

Help Dink, Josh, and Ruth Rose solve mysteries from A to Z! This collection includes Detective Camp, Mayflower Treasure Hunt, White House White-Out, and Sleepy Hollow Sleepover.

Amelia Bedelia is the world's most literal-minded housekeeper, who causes quite a ruckus whenever she's given a chance. In "Amelia Bedelia and the Surprise Shower", she arrives with a garden hose and the party is turned into an uproarious mess. In "Play Ball, Amelia Bedelia", her literal-mindedness adds a new dimension to the game of baseball, and "Thank You, Amelia Bedelia" features Amelia Bedelia "pairing" the vegetables and separating the eggs.

Follow the adventures of Zoey and her cat, Sassafras, with this collection of books one to six in the series. Each story features a new magical animal with a problem that must be solved using science. There isn’t a set formula for each book; Zoey sometimes needs to run experiments, while other times she needs to investigate a mystery, and yet other times she needs to do research. Zoey models how to keep a science journal through her handwritten entries in each story.

Enjoy this collection of eight Magic Tree House audiobooks: Stage Fright on a Summer Night, Good Morning, Gorillas, Thanksgiving on Thursday, High Tide in Hawaii, A Big Day for Baseball, Hurricane Heroes in Texas, Warriors in Winter, and To the Future, Ben Franklin!

In the first book in this series, eight-year-old Drake is snatched up by King Roland's soldier and taken to the castle. He is to be trained as a Dragon Master. At the castle, he is joined by three other young Dragon Masters-in-training: Ana, Rori, and Bo. The Dragon Masters must learn how to connect with and train their dragons - and they must also uncover their dragons' special powers.