As her senior capstone project, Pippa Fitz-Amobi is determined to find the real killer in a closed, local murder case, but not everyone wants her meddling in the past.

Nate the Great solves the mystery of the missing picture.

At a doll collector's request for help, a young sleuth searches for an old album, a lost doll, and a missing gypsy violinist.

While solving the mystery of an old man's disappearing fortune, Nancy ends a family feud and reveals the identity of an orphan of unknown parentage.

A chance meeting with a stranger on the road provides the Hardy brothers with a clue to a gang of local burglars.

Their efforts to recover a stolen ancient chess piece lead the Hardy brothers to Hong Kong where they help smash an international criminal organization.

Nancy receives a letter meant for a British heiress who has the same name and, in her attempts to contact the other young woman, faces danger from a man who operates a Lonely Hearts Club mail fraud.

After the new hydrofoil they are guarding is stolen, the Hardy boys face frequent danger in solving a mystery involving criminals who operate by signs of the zodiac.