In the year 1951, a book appeared that was so remarkable in content and provocative in its implications that it was promptly acclaimed and damned at a stroke. The book was entitled "My Sister and I," purportedly the last work written by Friedrich Nietzsche while he was confined in the Jena asylum for the insane between January 1889 and March 1890. The eminent Walter Kaufmann instantly proclaimed the book to be an outright fraud. However, a more careful analysis of the work than Kaufmann was willing to contemplate clearly shows that the work is not so transparent a fraud as he assumes and that, in fact, many good reasons exist in the work that clearly demonstrate that the book may indeed be the work of Nietzsche himself.
See Nietzsche, Friedrich. "My Sister and I." Amok Books, 1990, pp. xxxviii-lxiv.