Lucy Armstrong spends most of her time sleeping due to her dependency on prescribed medication - her grief caused by her environmentalist husband Jarrah Armstrong, who disappeared in the Tasmanian wilderness some eight months earlier.
Sass is a very vocal girl, while Bike chooses never to speak, similar to David who prefers isolation. When he arrives in Tasmania under the alias of a professor from a university, he takes up a temporary residence at a rural location with a single mother named Lucy Armstrong (Frances O'Connor) and her two young children Sass and her brother Bike. His orders are to recover tissue and organ samples and to report back once he gathers them, as the company is convinced the sighting reports are reliable. A mercenary hunter named Martin David (Willem Defoe) is hired by a military biotech company called Red Leaf to go to Tasmania and follow up on two sightings of the presumably extinct Tasmanian Tiger.
