Sly the Sleuth, also known as Sylvia, solves three mysteries for her friends and neighbors, all involving pets, through her detective agency, Sleuth for Hire.

A Hollywood actress, who had been competing with Sammy’s mother for an important role, is murdered, but thirteen-year-old Sammy and her friend Marissa are on the case.

When Cam Jansen and her friend Eric uncover a mystery while selling fudge door-to-door to raise money for the local library, Cam uses her photographic memory to foil a crime.

Orphans Sabrina and Daphne Grimm are sent to live with an eccentric grandmother whom they have always believed to be dead.

Sophie and her friends, who call themselves The Red Blazer Girls, embark on solving a case involving mistaken identities, switched paintings, and some priceless family heirlooms.

When the Black Dinosaurs, a club made up of four friends, discover what’s hidden in an old trunk buried near their clubhouse, they set out to solve the mystery.

When Annie tells him about her missing painting, Nate the Great and his trusted companion, Sam Spade, set out to investigate, gather clues, and solve the mystery.

Jigsaw Jones investigates when the champion frog in a frog-jumping contest mysteriously disappears.

Each chapter is a new mystery to be solved: The case of the stolen money — The case of the talking house — The case of the two-timers — The case of the false teeth — The case of the skin diver — The case of the barefoot thieves — The case of the dog-paddle derby — The case of the broken globe — The case of the pet skunk — The case of the seven-foot diver.

When twelve-year-old Steve Brixton, a fan of Bailey Brothers detective novels, is mistaken for a real detective, he must elude librarians, police, and the mysterious Mr. E as he seeks a missing quilt containing coded information.

Saxby Smart, schoolboy private detective, invites the reader to follow the clues as he investigates three cases involving hidden treasure, a string of break-ins where nothing is stolen, and a rare comic book taken from an undamaged safe.

When Ned convinces Nancy to join him at the Rocky Isle Marine Institute in Maine, she discovers that the aquarium’s baby dolphin is being held for a million-dollar ransom.

Almost-fifteen-year-old psychic investigator Gilda Joyce interns for the summer at the International Spy Museum in Washington, D.C., and solves a mystery involving national security.

When someone steals her purse and her identity, high-school junior and reluctant girl sleuth Lulu Dark investigates.

Frank and Joe Hardy follow dangerous copycat pranks to a criminal group, identify the culprits who key an expensive car and post a video on the Internet; investigate the disappearance of an amusement park patron; and seek two missing girls.

Mickey Bolitar and his friends continue to investigate the Abeona Shelter, while Mickey searches for answers about his father’s tragic death.

The intrepid Herculeah Jones helps her mother, a private investigator, solve a puzzling and frightening case.