A fairy tale about Petr the coal miner and Sklenáříček the elf... You may find it incomprehensible that someone could crave wealth as strongly as Petr the coal miner in today's fairy tale. And to get it, he accepts an incredibly cruel offer. Believe me, it won't be long before Peter understands what true wealth in life is. His pathological desire for wealth has brought him to the brink of destruction. The evil forest spirit Obrmichal manages to replace Peter's heart with a piece of cold stone, but not for long. Regaining his own human heart will restore Peter's love for people and compassion for his fellow man...