Zsigmond Móricz wrote his novel Butterfly in just a few days in 1924. Móricz tells the story of a mighty love that triumphs over adversity and is all-powerful in the language of ordinary people. The love of Zsuzsika and Jóska is presented through the "lightning and veil-soft" emotions of the director, László Vitézy's television adaptation. After The Legend of Hortobágy (Komorló) and The Sky Bird, this is the third film made by László Vitézy based on the writings of Zsigmond Móricz.

The widowed king was bewitched by the beauty of the devils' lover. The new queen wants to create the opportunity for the devils to gain power on earth. Only one man can stop their plan: John, who can do anything with his miraculous magic.