Only we know

Lauren's family have just moved house, and a new home means a new school. Lauren is determined to take this opportunity to completely reinvent herself and she quickly makes friends and settles in to her new life. Everything's going to plan until she runs into Harry, a boy she met four summers ago. Luckily for Lauren, Harry doesn't seem to remember her, and she knows it has to stay that way. Then, just when things are starting to go well again, creepy packages start appearing in Lauren's locker with no explanation. Finally she receives a disturbing anonymous note: 'Isn't it time your new friends knew all about you?' Who is sending these chilling messages? And what is the secret that Lauren is desperate to keep hidden?