"Whatever sympathy for Cagliostro my researches may have evoked it has always been exceeded by contempt of those who, combining an unreasoning prejudice with a slovenly system of compilation, have repeated the old charges against him with parrot-like stupidity. The object of this book is not so much an attempt to vindicate Cagliostro as to correct and revise, if possible, what I believe to be a false judgment of history."