An introduction to the authoress book (forthcoming under the same title, to be published by WAB Publishers). She has prepared a collection of interviews held over a few years by her students talking to people of Sandomierz region. The starting point for their conversations was a painting by a 18th-century artist Karol de Prevot, showing a ritual murder committed by some Jews against a Christian child, which has been hanging by this very day in the Sandomierz cathedral. As it has appeared, a belief in that bloody legend has prevailed among the interviewed, the picture having remained a sort of relic by itself. On this basis, the authoress makes certain generalisations by making blood libels myths part of the context of W. Propp's fairylike compositions, tracing the explanation of their curious vivacity down there.