Hannah, bestselling Australian crime author, is crafting a new novel that begins in the Boston Public Library: four strangers are sitting at the same table when a bloodcurdling scream breaks the silence. A woman has been murdered. They are all suspects - and one of them is a murderer. While crafting this thriller, Hannah shares each chapter with her biggest fan, Leo. But Leo seems to know a lot about violence, motive, and how exactly to kill someone. Perhaps he is not all that he seems...