A Chilean couple, Tomas and Helena, living in Barcelona in the grip of a heat wave receive an unexpected visitor: Sandra, the girlfriend of Helena's recently deceased younger brother. Nymph-like Sandra is in no hurry to leave and slowly manages to wind both of them around her little finger. Tomas is trying to finish his self-help book in spite of his writer's block and Helena can't get her dead brother out of her mind. Sandra provides a welcome distraction, and soon becomes the object of the couples' desire. With relationship boundaries blurred, passions are ignited in this erotic art house drama.