Exhausted from over-work and suffering from the humidity of a scorching summer, David has little idea what awaits him when he agrees to this act of kindness.

As he drives the decrepit overloaded car north, hungover and agitated David attracts the unwelcome attention of the traffic police, suspicious of his intentions. 

Further, he is drawn into the strange world of Martha, who begins to confuse him with her daughter's partner, recently killed in a road accident.

As cabin fever sets in, and his companion's behavior becomes increasingly erratic - flirtatious, salacious, hostile, vindictive - David begins to realize he is in danger.

Quite what type of danger will come as a nasty surprise. The trouble is, David is so caught up in the situation that even when he clearly sees the threat coming, he drives straight into it.