A truck driver named Pat Quid, who often keeps himself entertained by creating backstories for the people he sees on the road, is hauling meat across Western Australia. Accompanied by his dingo, Boswell, Quid starts to notice some unusual activity, including a green van that seems to be following him. When he hears radio reports about a serial killer targeting women along his route, Quid becomes increasingly suspicious of the driver of the green van and starts to form connections between the reported murders and the strange behavior he has observed.

On his journey, Quid picks up a hitchhiker named Pamela, who goes by "Hitch." She becomes intrigued by Quid's theories and decides to join him in his investigation. Together, they drive through remote areas trying to uncover evidence that links the mysterious van driver to the killings. Along the way, Quid's obsession with solving the case risks putting both their lives in grave danger as they get closer to confronting the potential murderer.