In "Zarathustra's Secret: The Interior Life of Friedrich Nietzsche," he assumes that the philosopher had plenty to hide and uses letters, poems and his imagination to fill in the blanks.

BOOK REVIEWS: This lucid and insightful biography reveals the life-long ill-health and volatile relationships that shaped Friedrich Nietzsche's most powerful and enduring ideas ...

Friedrich Nietzsche is famous for this kind of bombast, but most of his works are unassuming in tone, and his sentences are always plain, direct and clear as a bell. Take for instance the celebrated ...