Czech schoolboy Jenik (Ludek Navratil) has an unconventional home life. His father (Jaromir Hanzlik) is a shipboard doctor who spends long stretches at sea, and his overprotective mother (Katerina Machackova) won't let him play with the rough neighborhood boys. As he makes friends with fellow misfit Lucy (Katka Pokorna), his father sends him a butterfly larva from an exotic port of call. When Jenik and Lucy hatch it, a magical fairy appears in their lives.