People say time and time again that you should never judge a book by its cover. To look at it literally, as someone who worked at a bookstore for 7 years, and somebody who has studied book marketing, I can tell you that this is not everybody's policy. The #1 thing that will work to market a book is how the cover is designed, and speaking as a reader, I know how easy it can be to get turned off from buying a book from a poorly designed, unattractive cover.
When it comes to Everything, Everything, a YA novel by first-time author Nicola Yoon, if this colourful, intricate, gorgeous cover doesn't sell you immediately, then the plot certainly will :)
Madeline Whittier was born with a disease that "is as rare as it is famous," which you learn right from the first words of the synopsis. Maddie is basically allergic to the world, and because of this she has not set foot outdoors since before her sickness was discovered when she was a little baby. The only people that are admitted through the air-lock front door are Maddie's mother and her nurse, Carla. That is, until a family moves in next door, including the black-clad teenage boy named Olly.
It's easy to determine that if Madeline were a real person, she would be an iggle, no question. She's an avid reader, writes super-short book reviews on Tumblr, she plays an ultra difficult but fun-looking game known to her and her mother as Phonetic Scrabble, and even if all of her incoming mail needed to be 100% disinfected before she could touch it, she would still love getting mail and other gifts from geek girls around the world.
