Andrea has an unusual sense of smell. She grows up to be a pheromone researcher for the U.S. Department of Agriculture and a perfume maker in Paris. But one idea haunts her: who is her real father? Is it the man her family says is her father, or is it his live-in companion? Andrea follows them to San Remo, where she tests her hypothesis, with startling results that disrupt her family on both sides of the Atlantic.