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.

Fifth-grader Cam uses her photographic memory, with help from her friend Eric and his twin sisters, to solve the mystery of Poochie, a famous canine television star.

Fifth-grade sleuth Cam Jansen uses her photographic memory to solve a monkey-smuggling mystery at the city zoo.

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

When she notices some bones missing from a dinosaur skeleton exhibited in the museum, a young girl with a photographic memory tries to discover who has been taking them and why.

Nancy Drew's sympathy for adopted twin babies leads her into a surprising mystery. Here is a reproduction of the original book, just as it was originally published in 1934. Illustrations.

Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he investigates such cases as whether a diary of George Washington's mother is authentic, or if a UFO picture supposedly taken by the army is real.

Freddy the pig does some detective work in order to solve the mystery of a missing toy train.

The Murder of Roger Ackroyd is one of Agatha Christie's most celebrated novels and a defining work in detective fiction. Published in 1926, it features her iconic Belgian detective, Hercule Poirot, who has retired to the quiet English village of King's Abbot. However, Poirot is soon drawn back into action when the wealthy Roger Ackroyd is found murdered under mysterious circumstances. The story is famous for its innovative narrative style and shocking...