Stardust by Neil Gaiman is a wonderful book. What is it about? (partial summary from goodreads)
... tells the story of young Tristran Thorn and his adventures in the land of Faerie. One fateful night, Tristran promises his beloved that he will retrieve a fallen star for her from beyond the Wall that stands between their rural English town (called, appropriately, Wall) and the Faerie realm. No one ever ventures beyond the Wall except to attend an enchanted flea market that is held every nine years (and during which, unbeknownst to him, Tristran was conceived). But Tristran bravely sets out to fetch the fallen star and thus win the hand of his love....
I like the book immensely. After I finish reading it, I think the writer had craft a wonderfully written book. More like a gritty love story meets fairy tale. It have everything that a fairytale-loving heart could love, prince and princesses, curses, witches, goods triumphing over evil. But it is also dark, it does not shy away from gore or violence or passion.
However why I chose Stardust for favorite book turned into a movie is because the movie surpassed my expectations and become even better than the book. For a book nerd, that it something that rarely happened. Movies tend to screw plots and characters and flow of the stories. However I believed Neil Gaiman lend his talent on the movie and turned it into something else. I had reviewed the movie a few years earlier, so I won't be talking more about and you can go there instead to see what I gushed.