A hot bank holiday weekend in the countryside turns into a nightmare for two couples as sexual tensions, male rivalry and accumulated secrets creep to the surface.

The rivalry between Ian and Ollie intensifies during the second leg of their competition, and the oppressive heat serves only to heighten the tension as the late summer break continues.

As the gap between Ian's perception and reality grows, so does his manipulation of Ollie, whose behaviour is becoming increasingly erratic. With emotions running high, the triathlon ends in a head-to-head battle - leading to devastating consequences for the rivals and their partners.