Delivering a doll to a mysterious antique dealer leads fourteen-year-old Trixie Belden to investigate a case of counterfeiting.

While vacationing at her uncle's lodge in the Ozark Mountains, Trixie and the Bob-Whites explore caves looking for the ghost cave fish, a rare species wanted by a national science magazine.

Trixie suspects someone of trying to sabotage the pet show that she and the Bob-Whites are staging in order to raise money to feed the starving game-birds.

Vacationing on a Minnesota horse ranch, Trixie and her friend, Honey investigate the reported sightings of a legendary ghost and join the search for a missing Arabian horse.