It's the middle of summer in mirabeau, Texas, but already garnet hubbard looks forward to fall -- to entering seventh grade and becoming a teenager at last. With opal, her beautiful and popular fourteen-year-old sister, ...It's the middle of summer in mirabeau, Texas, but already garnet hubbard looks forward to fall -- to entering seventh grade and becoming a teenager at last. With opal, her beautiful and popular fourteen-year-old sister, as her guide, garnet is sure to have a great year.