I've just finished reading 'The Twelve' by Justin Cronin. Really enjoyed it. Waiting with anticipation for the third book. Any way, Justin Cronin used a prologue- this was used to update the reader on what happened in his first book - just in case they hadn't read it - very considerate of him, I thought. This makes sense to me but why do other writers use prologues when there is no need to. There's no need to update the reader on past evens because there aren't any. This is their first book. So why do insist on starting with a prologue whats the point?