Marjorie Weinman Sharmat

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.

Though it means Nate can't get his dog ready for the smartest pet contest, he agrees to search for the missing prize for the contest.

Even a deep snow the week before Christmas can't keep Nate the Great and his dog Sludge from finding the special card sent to Annie's dog Fang by his mother.

Nate the Great: "When Nate gets an urgent call from Annie about a lost picture, he immediately plunges into his new and baffling case with the cool detachment of a Sam Spade. Nate, the boy detective who likes to work alone, solves the mystery and tracks down the culprit. In the process, he also discovers the whereabouts of Super Hex, the missing cat"--Publisher. Nate the Great goes undercover: "Nate the Great has his first night case! Somebody is...

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.

Nate the Great and his cousin Olivia are on the case of a runaway turkey, but unfortunately the clues appear to contradict each other.

Nate the Great
When Nate gets an urgent call from Annie about a lost picture, he immediately plunges into his new and baffling case with the cool detachment of a Sam Spade.
Nate the Great Goes Undercover
Somebody is raiding Oliver’s garbage can each night, but who? The list of suspects is long!
Nate the Great and the Halloween Hunt
Nate’s good friend Rosamond needs his help. Her cat Little Hex is missing....

Nate and his dog Sludge try to solve a case on Halloween night and find themselves locked in a haunted house.

Lost List
When Nate’s friend Claude’s grocery list is lost, Nate sets out to find it before lunch. 

Sticky Case
A stegosaurus stamp belonging to Nate’s friend Claude disappears, and the indomitable Nate the Great is called in on the case. 

Fishy Prize
When the prize for the smartest pet contest disappears, it’s up to Nate and his dog, Sludge, to find the prize. 

Boring...

A dinosaur's exuberance about moving cools considerably when he realizes how much he misses his next-door friend.