I very much enjoyed the endgame section in How to Reassess Your Chess
. Believe it or not, despite the fact that I'd been playing chess for over 15 years, I knew next to nothing about how to win an endgame or how to force the opponent to play exactly as you want. This book was a real revelation for me, as it was written simply, not couched in that interminable, undecipherable chess lingo that the old masters often used.
The rest of the book is very typically chess-y, but the endgame section alone is enough to warrant four stars.