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Dink and his friends use their detective skills to locate a giant emerald missing from a statue delivered to Uncle Warren's museum in New York City.

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.

An old pirate map leads George and his friends to a mysterious network of trap-laden tunnels beneath New York City.

George van Gelder and his friends, having found Captain Kidd's secret journal, now know for sure there is a priceless gem buried deep beneath New York City, but they soon discover the treasure is not going to give itself up easily.

Eleven-year-old Samantha moves with her family into a luxury Manhattan apartment building in 1904 and soon becomes involved in investigating whether a series of mishaps is related to a curse on the building's owner.

The Smithfork children move to Manhattan's swanky Fifth Avenue and discover the clues to a decades-old mystery embedded in the structure of their new apartment.

After Rebecca meets a new family in her New York City apartment building and helps watch their fussy baby while they are moving in, she becomes convinced that they have been victimized by the kidnappers that have been operating in their neighborhood.

On her first day in New York City with her younger brother, Kevin, twelve-year-old Lexi overhears thieves discussing where to hide stolen jewels, and the siblings, along with their aunt's neighbor, Kim Ling, skip day camp to investigate "the crime of the century.

Tandy Angel is, along with her brothers, a suspect in their parents' murder but having grown up under Malcolm and Maud Angel's perfectionist demands, Tandy decides she must clear the family name no matter what.

In early twentieth-century New York, Sacha Kessler's ability to see witches earns him an apprenticeship to the police department's star inquisitor, Maximillian Wolf, to help stop magical crime.

Christina, Grant, Benjamin, and Katherine become gridlocked in a mystery that takes them on a hair-raising history tour of New York City's most famous landmarks to find a priceless missing part of history.

Hunter Braque, a New York City teenager who is paid by corporations to spot what is "cool," combines his analytical skills with girlfriend Jen's creative talents to find a missing person and thwart a conspiracy directed at the heart of consumer culture.

Susan, eleven years old in 1914, encounters a mystery through an independent-minded female boarder and becomes involved in the growing suffrage movement in New York City.

After Delia Truesdale's mother disappears, everyone else believes she is dead.

Adopted by famous Pinkerton Agency Detective Hawking in 1895 New York, fourteen-year-old Carver Young hopes to find his birth father, but when he becomes involved in the pursuit of notorious killer Jack the Ripper, Carver discovers that finding the truth can be worse than ignorance.