The Luminaries, by Eleanor Catton. This was pretty impressive and I did enjoy it. However, around page 530, with 300 pages to go, I started to wonder if there is a secret Booker point system which the committee references:
Australian author: 5 points
Period setting: 10 points
Epistolary chapters: 2 points per chapter
Long as balls: 15 points
Author is Peter Carey: 25 points