The summer she is invited to join the Trail Blazers Club with her prized golden palomino filly, 16-year-old Linda searches for her family's jewels, hidden by an ancestor in 1846.

The summer she is invited to join the Trail Blazers Club with her prized golden palomino filly, 16-year-old Linda searches for her family's jewels, hidden by an ancestor in 1846.

From a clue hidden on the historic Mojave Trail, Linda and her prize palomino track down a band of smugglers.

While staying at the Quinta Floresta Ranch in Mexico where she is to ride in a fiesta, Linda becomes involved in the investigation of the mysterious disappearance of the ranch's water supply.

When the theft of the final clue for the newspaper's mystery contest places Mrs. Bobbsey's job in jeopardy, the twins race the clock to catch the crook before press time.