— Poor coal burner Peter Munk lives in a hut in the deep Black Forest. He dreams of a better life, of prestige and money – and of marrying beautiful Lisbeth. And so Peter hopes for the help of the good spirits of the forest, about whom it is said that they have already helped many people. In his search, Peter meets the dangerous Dutchman Michel, who offers him a diabolical pact: he promises Peter lifelong wealth. In return, he demands Peter's warm, pounding heart ...