So this book... first of all it has nothing to do with ghosts or heaven as the title suggests. 
 There are 4 parts and I read them in the order they are. 
 Quarter One: Whispers in the dark 
 I loved how the author takes you back to the pre-historic time and I feel the way the story is written is partly responsible for this. It revolves around a girl who wants to tell the stories, to make the marks. (view spoiler)[ I honestly thought that the story was about how the need for a script came into existence and that's what the girl realizes in the end "she could have saved them if she had a left a mark which meant run". And the way the story ends, it is a little terrifying.. sitting alone in the dark waiting for the end to come (hide spoiler)] It was a good read. 
 Quarter Two: The Witch in the Water 
 I did not like this story. It is about a girl who is accused of witch craft. (view spoiler)[ Only because it left me so helpless. All those spineless people (hide spoiler)] I did not see the connection to the spiral in this one. 
 I stopped reading after this and picked up the bok after a gap. 
 Quarter Three: The Easiest Room in Hell 
 This story reminded me of all the experiments carried out on the insane in the 1900's. I knew this part would be there (view spoiler)[ the attenders raping the insane women (hide spoiler)] It looks like every mental asylum story has to have it!! Go figure. I was not able to make out that there was something wrong in the relationship between Doctor James and Verity though. It seemed normal to me. (view spoiler)[The sort of treatment meted out at the asylum was quite normal at the time. It's hard to read it though. I am glad about what happens to Doctor Philip in the end. (hide spoiler)] I could not understand Charles Dexter nor understand his poems that James. (view spoiler)[ Is Charles psychic?? (hide spoiler)] We do see a small connection here with the previous story (view spoiler)[ the witch hunt story that Verity reads in the library (hide spoiler)] All in all the ending was good and if not predictable it was expected. The whole story spans just 15 days. But again I did not get the connection to the spiral. 
 Quarter Four: The Song of Destiny 
 Now the name of this story is the name of the space craft. It is a Sci-Fi mystery story and very well written. Bowman is travelling to an unknown planet to colonize it and his 'cargo' are humans who will populate this new planet. Half way through I figured out who was responsible for the deaths on the ship but now why. I think I still do not understand why. This story really focuses on the whole spiral concept. (view spoiler)[ If his future self sends the distress signal and is responsible for the deaths which leads to the eventual revelation of the lies told to him which forces him to change course then Bowman's decision to go explore the planet he is stranded on will result in the collapse of the time loop forcing his past self to continue on the path to the new plant..... phew. I'm not sure how much of that makes sense. Now is this earth or earth from an alternate dimension where the girl is the one who makes the marks?? (hide spoiler)] Overall the best story in the book. Guest appearance by (view spoiler)[ Charles from the third story (hide spoiler)] And I loved how the chapters denote the Fibonacci numbers which appears everywhere. And this is related to the spiral in a very complicated mathematical way...(which I will try to read upon and understand) 
 All in all a good read.