Another young historical novel by the authors of Golden Letter to Siam tells a story of Alta California when it was Mexican and shows the same qualities of good research and steady narration as the former. The del Mars own the Ranch of a Thousand Horns and this particular episode in their lives is seen through the doings of young Felipe, 13, and his sister Clara. As the story opens the children are to have a tutor, their cousin Inez who comes from Mexico to live with them. There is the land question too as new laws are being made by the Mexican government, and the situation is brought forcibly home to the del Mars who have lost the grant parchment that entitles them to their ranch. Subsequent events develop a good picture of the territory and the times, of the United States as well through young ll Haven who comes to settle nearby, and there is a satisfying completeness when the grant is found and Felipe is given his first small herd.