The film Butterfly is set in Paris in 2005 and follows the adventure of an 8-year-old girl and her elderly neighbor as they search for a rare butterfly. The girl feels lonely as she comes from a single parent home where her mother is distracted, so she decides to run away. Her neighbor is also lonely since he lost his son and immerses himself in collecting butterflies. Through their journey together finding the butterfly, the two develop a friendship that helps fill the voids in their lives left by family.