On one of their usual weekly commutes into the city, two perfect strangers--Dr Alec Harvey, an esteemed suburban doctor, and Anna Jesson, a middle-class housewife--will inadvertently find love, when a bit of dirt enters Anna's eye and the good doctor comes to her rescue. Despite both being married to others, this fleeting but powerful interaction will prepare the ground for an unforeseen erotic but unconsummated love affair, as one clandestine rendezvous leads to another. Where is this intense emotional infidelity heading?