Flambards by KM PEyton - Horse mad at 8, I devoured these books feeling so grown up and sophisticated reading about what seemed to me to be the glamourous life of Christina and the decaying mansion she called home as the Great War approached.
Lord of the Flies by William Golding - Started this maybe for a grade 8 class and finished it in one go, sitting so long my hands were cold and stiff and when I looked up I was surprised to find darkness had fallen. I went downstairs seeking family, warmth and familiarity...anything to get rid of the strange feeling that lingered after the book was done.
To Serve Them All My Days by RF Delderfield - One of my first "grown up" books that started my love affair with the whole Edwardian period of rural Britain
The Princess Bride by William Goldman - Witty and clever, it was the movie and more (a rarity too in that I saw the movie first, and love both equally).
The Sunne In Splendour by Sharon Kay Penman - Richard III, need I say more.
Honourable Mentions: The Wine of Angels (Merrily Watkins detective series), The Road (except I won't read it again - too much for me, but brilliant), The Da Vinci Code, Harry Potter. Also some books that were among my early reads and got right into my soul so I can't recall a time without them ie: King Arthur legends, Robin Hood.