Jim Butcher shocked all his fans by killing Harry Dresden at the end of the novel Changes. The next novel, A Ghost's Tale, was written from Harry's ghost's point of view! If you haven't read Cold Days yet, read the novella Bolt from the Blue first. In it, a young student of Harry Dresden, trying to resist the forces of darkness without her mentor, discovers that becoming his worthy successor is not so easy, and that she better learn everything quickly - otherwise she will die.