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The English-language title of this Italian thriller is The Spider's Nest. Ronald Wybenga plays an American scientist, who travels to Budapest to confer with a famous colleague. Upon arriving in Hungary, Wybenga discovers that the man he was to meet has died under mysterious circumstances. It seems that the late scientist was on the verge of revealing the existence of a bizarre spider cult. Now Wybenga finds himself a marked man...and thereby hangs the rest of this suspenseful tale.