About the book: 1976 / "Transplantation of human organs is a real achievement in medicine, promising great opportunities as one of the ways to prolong life. But a lot of problems immediately arise - social, moral, legal. Does a living person have the right to sell his healthy heart? Does someone in need of a healthy stomach have the right to find a “donor” and negotiate a price with him? It is easy to imagine a situation where body organs will be paid for in advance and, as needed, removed from healthy people who have signed a “contract with the devil.” The events depicted in Sheikin’s story are very plausible.” (From the preface by Evg. Brandis to the collection of stories and short stories by Leningrad science fiction writers “The Invisible Bridge»).