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

"Players move into the next round of the Grandest Game, where millions of dollars in prize money are on the line-and new relationships, motivations, and threats come to light"-- Provided by publisher.

Detectives-in-training Milo and Jazz must put their skills to the test to solve the mystery of how the water in the town swimming pool turned purple.

Sixth-grader Ben Pratt's life is full of changes that he does not like--his parents' separation and the plan to demolish his seaside school to build an amusement park--but when the school janitor gives him a tarnished coin with some old engravings and then dies, Ben is drawn into an effort to keep the school from being destroyed.

Resident sleuth Teddy Fitzroy is on the case to find a missing African elephant and clear his friend Xavier of vandalizing a bulldozer in protest of a builder ruining a beloved piece of land they call TurtleTown.

Dink, Josh, and Ruth Rose investigate a mysterious man in black who Josh believes is a vampire.

While visiting Dink's uncle in New York City, Dink, Josh, and Ruth Rose help uncover who is responsible for stealing a very valuable painting.

A hard-bitten former search-and-rescue dog helps solve a complicated missing chicken case.

Encyclopedia Brown, boy detective, solves ten more mysteries. The solutions are given at the end of the book

Dink, Josh, and Ruth Rose help catch the thieves who have stolen gold from Sammi's parents, the king and queen of Costra.