After a storm blows through Sleepyside and damages the Bob-Whites' clubhouse, Trixie and Honey take a job patrolling the game preserve and find evidence of a poacher.
While spending Christmas break at an Arizona dude ranch, Trixie and the Bob-Whites work to solve several mysteries--a phony cowboy, disappearing staff, and puzzling cries in the night.
While preparing for a fund-raiser antique show, Trixie and the other members of the Bob-Whites discover a secret code in the pages of an old magazine in the attic.
Thirteen-year-old Trixie Belden and her friend Honey make several trips to the local marsh in search of herbs and flowers to replace their teacher's plant specimen collection and to look for the pirate treasure that is rumored to be hidden there.
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.
When the Bob-Whites--minus Dan--head to Cobbett's Island to spend ten days in a historic home on the beach, Trixie finds an old letter tucked away in a book and sets off on a long-delayed treasure hunt.
While on a trip to St. Louis, fourteen-year-old Trixie Belden discovers some mysterious papers in her hotel room and soon realizes that she and her friends are being followed as they cruise in a towboat down the Mississippi River.