Marjorie Weinman Sharmat

Olivia Sharp is good at uncovering secrets, and discovers several when on a trip to Carmel, California to help a friend become a member of an exclusive club.

Wealthy secret agent Olivia Sharp helps depressed Duncan find a friend.

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

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

After Thad embarrasses Maggie and she retaliates by embarrassing him even more, he plots revenge.

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

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