What book has fundamentally changed your perspective on life?

I've never really read books as i'm dyslexic and the form factor of books and the process of having to concentrate on page after page was always intimidating for me growing up.

I have recently downloaded a wonderful iPhone app called vBookz ePub which reads entire books out to me in a completely natural voice!

I have just read (or listened to) Enders Game in about 8 hours and am thirsty for books!

I studied literature at school and am particularly fond of books which make you think like Catcher in the Rye and Enduring Love.

I am looking for books which will help to challenge my worldly beliefs :)