Glinda of Oz is the fourteenth and final book of the original Oz series written by children's author L. Frank Baum, published on July 10, 1920. Like most of the Oz books, the plot features a journey through some of the remoter regions of Oz; though in this case the pattern is doubled: Dorothy and Ozma travel to stop a war between the Flatheads and Skeezers; then Glinda and a cohort of Dorothy's friends set out to rescue them. Glinda of Oz is thought to be the darkest of the Oz books due to Baum's failing health.