Miranda's life is starting to unravel. Her best friend, Sal, gets punched by a kid on the street for what seems like no reason, and he shuts Miranda out of his life.The key that Miranda's mum keeps hidden for emergencies is stolen. And then a mysterious note arrives:'I am coming to save your friend's life, and my own. I ask two favours. First, you must write me a letter.'The notes keep coming, and Miranda slowly realises that whoever is leaving them knows things no one should know.Each message brings her closer to believing that only she can prevent a tragic death.Until the final note makes her think she's too late.