There's a killer at Ruby's new school. It's Ruby.On her first day at a new school, Ruby finds a note in her locker saying "I KNOW YOU DID IT". She's terrified that someone has found out she was responsible for the death of a girl called Hannah in a playground when they were both toddlers - a secret that has haunted her for years.When first one, then two students are found dead, it looks like another killer is framing Ruby.Or, she might be next...A winner of ...