"Journey by Moonlight", by Szerb Antal. Widely available English (and Italian);
In Polish, it's available in Biblioteka Krakow.
https://www.krakow-biblioteka.sowa.pl/index.php?KatID=0&typ=repl&plnk=q__Podr%C3%B3%C5%BCny+i+%C5%9Bwiat%C5%82o+ksi%C4%99%C5%BCyca&sort=byscore