You're re-reading one of your faves when someone asks the dreaded question: "What's that book about?" Give us your best off-the-cuff blurb of any book, any genre, and have your readers try to guess the title in the comments!
Love is forbidden. In fact, it's a disease. The main character in this book will stop at nothing to be cured. That is, until she finds out her best friend has a huge secret she's been keeping from her and then the unthinkable happens: she falls in love.