What is the theme in Stiff: The Curious Lives of Human Cadavers by Mary Roach?

Death is inevitable. A cadaver or "stiff" represents death or the eventual fate of all humankind. The idea is so fundamental to the human experience that it necessarily invokes a personal response in the reader. Implicit in every passage is the realization that every human being will eventually be "it" or the cadaver, the decaying remains of what once was a human being. This experience is something that reader brings to the text before the book is opened.