Back of book-
It's going to be one of the most amazing adventures The Saddle Club has ever had!
Stevie Lake, Lisa Atwood, and Carole Hanson are going to horsey old England. They'll even ride in a show on the grounds of a real castle. Lisa has done some homework and discovered an ancient unsolved mystery about the duke who once lived there. The duke buried treasure under the stall of his spirited stallion. Then tragedy struck-- the barn burned down and the stallion perished. A year later, the duke's body was found on the same spot, his hand clutching a single fire opal... Legend says the treasure will be found by a rider with fire in his heart.
The girls are busy with the show, sightseeing in London, and getting ready for a costume ball at the castle. On that special night, it seems that almost anything could happen-- but the story of the duke, his stallion, and the tragedy of the burning barn couldn't replay itself, could it?