When fourteen-year-old Nora Donovan hears that Spanish soldiers may be sailing near the west coast of Ireland, she never expects that one of their ships will actually crash on the shore next to her home. Helping to clear the wreckage, Nora discovers a beautiful white stallion, injured and lost. Nora boldly leads the horse to a nearby cave and nurses him back to health.

But hiding in the cave is one of the soldiers. He's also injured, very young, and wanted by the English army. Nora wants to help the boy get home safely, but she'll have to risk everything—including the magnificent stallion.