On her way to Red Gate Farm, Nancy encounters a mysterious saleswoman in a perfume shop, a curious man on the train, and a strange code to be deciphered, but when she arrives at the farm, Nancy is compelled to investigate her suspicions that part of the farm is being used for a secret society's meetings.
Twelve-year-old Steve is investigating a diamond heist but the case suddenly changes when the author of the Bailey Brothers detective novels writes him a letter to say that he fears for his life.
Saxby Smart, a young detective who solves cases from a tool shed, deals with a case of stolen comics as well as neighborhood intruders while sharing clues to allow the reader to help solve the mysteries.
Leon and his friend Susan discover something suspicious going on in their tiny little village of New Auckland, and soon find themselves involved in an archeological mystery.
A lonely boy named Radish Rademacher hopes to become a member of his twin sister's detective agency after showing the members an old treasure map he found in a cave.
A group of children, entranced with the study of Egypt, play their own Egypt game, are visited by a secret oracle, become involved in a murder, and befriend the Professor before they move on to new interests, such as Gypsies.
The mysterious death of an eccentric millionaire brings together an unlikely assortment of heirs who must uncover the circumstances of his death before they can claim their inheritance.
