Dr. Erin Harris may be a scientist, but she has an unscientific obsession: to find a living Varanus priscus. Cryptozoologists call it the Devil dragon. This giant Australian reptile went extinct some 12,000 years ago but like Bigfoot or Nessie, there are occasional sightings. Spurred by a credible witness, Erin cobbles together an expedition party consisting of herself, the witness, and his deer-hunting neighbors. They travel into the unexplored heart of a remote national park.
Erin, believing the Devil dragon to be a larger version of the Komodo, is confident she can outwit a specimen. However, the terrifying monster that lumbers out of the bush is a savage and unpredictable predator the size of a campervan. To escape, Erin must transform herself from genteel university lecturer to hardcore survivalist.