Lavina Cumming has spent her entire first ten years of life on the Bosque Ranch in Arizona Territory with her mother and father, five brothers, and her black mustang pony, Chummy. When her mother dies, her father decides it would be best if Lavina went to live with her aunt, where she can be brought up as a lady.
Starting off at dawn on September 16, 1905, Lavina travels by train to Santa Cruz, California. Armed with the Cumming family motto courage she arrives in a world of two-storey houses, automobiles, a new school, and her cousin, awful Aggie. Trying her best to settle in, Lavina is torn by her hopes to return to Arizona and be with her father. She is as shocked as everyone else by the great earthquake that nearly demolishes the nearby city of San Francisco. In the aftermath of the quake, she must make a big decision about her future. Based on the true story of the author's grandmother, the book includes a short afterword by the author.