Cecilia and Claudio are doctors at the same hospital. Neither has been lucky in love and both live in the shadow of broken marriages. Cecilia has two children to focus on, while Claudio has little of substance in his life, and is entranced from the moment they meet. Friendship comes naturally: they eat lunch together almost every day, they talk, sometimes even share secrets. But when their slow-burning passion finally boils over into action, Cecilia hesitates, and pushes her shy admirer away. And so fate intervenes, allowing a chance encounter to blossom into a love triangle that will tear them apart just as surely - in a bittersweet twist - as it must bring them together. Narrated by Claudio's son, the fruit of this fandango, looking back on how his father met his mother, Three Light-Years is an irrepressibly wry and impeccably observed love story, warning of the perils of playing it safe in matters of the heart.