Parasites are some of the nastiest creatures on earth. They will do anything to survive, including pirating nutrients and using mind control. Follicle mites feast on human skin cells. The corpse flower steals its host's DNA and the stickleback tapeworm tricks its host into becoming dinner. Parasites have adapted to every environment on earth and in the sea, but are these tiny creatures nature's monsters or do they play an important role in our ecosystem? Through intriguing photographs and accessible text, readers will dig into the science of parasites and explore how these creatures shape history.