This is more of a matter of who to turn into a reader. I might recommend different books to different people in various stages in their lives. For a younger person, I'd recommend Harry Potter or Percy Jackson, because both of them have such strong characters and are 'easy' reads. However, The Book Thief is a book I'd recommend to any one, at any time. It's a book that's been read many times, but I strongly believe it deserves to be read by even more people.