Marjorie Weinman Sharmat

Nate and his dog Sludge are determined to find the recipe for his mother's monster cookies.

Nate the Great investigates two cases that may be connected, involving a missing valentine and a valentine that came from nowhere.

As Nate the Great sets to work on his first international case, he searches for a lost "something" and saves the King of Sweden from a troublesome traveler.

As more and more of his flowers display the bite marks of a wandering tortoise, Nate sets out to uncover the mystery of the reptile's origins.

Nate the Great follows the clues to find his lost dog, Sludge, in a department store.

Nate the Great investigates the mysterious disappearance of the purple plastic octopus that his baseball team uses for second base.

When Rosamond's birthday gift for Nate disappears from her sled, the boy detective decides to unravel the mystery.

While traveling on the train to San Francisco with his cousin Olivia's owl, Nate the Great and his dog Sludge must use all of their detective skills when the owl suddenly disappears.

Oliver's boring blue beach bag is gone. Nate and his dog Sludge try to find clues to find the beach bag.

The reader is asked to help Nate the Great solve the mystery of his friend Annie's missing dog Fang.