The Plot for The Book was created by Adam Tyrrell. I believe he constructed a narrative that the entire team enjoys and believes in. We altered parts so that everyone had influence on the final piece.
We wanted to create the narrative first as we thought it would be easier to work backwards. Creating the scenes and the micro-features we would show. Then we worked on the story to show the rest of the films narrative. We made two drafts for the plot so that we had opportunity to change and also to be able to get feedback from focus groups.
Here is a link to Adam Tyrrell’s page about both drafts-