Ludwig Wittgenstein: The Duty of Genius
Most of the coverage on his core work escapes me. The book was written in 1990, 23 years ago, but does not give any sense of being outdated. A very well written book.
LW's relations with Keynes is intriguing. Why at his very young age he was already so sensitive about his Jewishness is puzzling. It would be very interesting to see some coverage of his experience with Virginia Wolf, if in fact they met.