While organizing an ice carnival to raise funds for her pen pal's school library, Trixie investigates a mysterious problem facing Regan and a run of thefts and accidents in the neighborhood.
When the Bob-Whites head to Cobbett's Island to spend ten days in an historic home on the beach, Trixie finds an old letter tucked away in a book and sets off on a long-delayed treasure hunt.
The Bob-Whites, plus their friends from Iowa, add detective work to their New York City sightseeing trip after Trixie helps a stranger and receives, as thanks, a purse containing a cryptic prophecy and a promise of great fortune.
