The Hollows series (also called the Rachel Morgan series) is a series of 16 urban fantasy novels, eight short stories, two graphic novels, and one compendium resource by Kim Harrison, published by HarperCollins Publishers, in an alternate history universe and set primarily in the city of Cincinnati and its suburbs. The alternate history is built upon two premises: the recent open existence of magical and supernatural species, primarily witches, vampires, and werewolves, with the human population; and the historical investment of Cold War military spending in genetic engineering as opposed to the Space Race, which resulted in the accidental release of a genetically modified tomato in the 1960s that killed a significant portion of the human population. The series is set approximately 40 year