Who killed Alex?

International best-seller in 10 countries. Over 41 million reads. Wattys Award.   Hannah  is a sixteen-year-old student hooked on social media. One day, she receives a friend request on Facebook from a boy named Alex Crowell. After accepting it, Hannah discovers that Alex is missing and that he is given up for dead. However, an eerie event takes place: Hannah gets a message from the boy, who asks ...