Unbelievable, Unforgivable, and Utterly Enraged

This is going to be short and very not sweet: what sort of preface writer spoils the twist in a novel without warning? Seriously.

I was planning on reading The Third Policeman by Flann O'Brien to kick off my new years resolution to clean off my bookshelves of unread volumes, and I was a few pages into the introduction when I was caught completely off guard by a 6th Sense/Usual Suspects level spoiler. Unforgivable! The novel is now completely ruined for me before I even began reading it!

The preface of a book is intended to enhance the book - provide a little background, a little context, perhaps lace in a few teasers. But spoilers?

Back it goes on the shelf. Hopefully I can manage to forget the spoiler's contents, and will be able to enjoy this book at a later date.