Two couples embark on a bank holiday weekend in the Suffolk countryside. The stifling weather intensifies the ominous atmosphere as sexual tensions and male rivalry quickly overshadow events whilst accumulated secrets and jealousies creep to the surface.
As the August bank holiday weekend away continues for our couples, the oppressive heat only serves to heighten the growing tension and creeping sense of unease which dominates. The rivalry between Ian and Ollie intensifies in the second leg of their 'Triathlon' and the peace is further shattered by the arrival of Daisy's colleague Milo whom Ian views with intense jealousy.
As the gap between Ian's perception and reality grows so does his dangerous manipulation of Ollie - whose behaviour becomes increasingly dangerous and erratic. With emotions running high, tragedy looms and the triathlon ends in a thrilling head to head battle with devastating consequences.