I just read that book recently, and while I enjoyed most of it, I found the chapter on the theories about the emergence of DNA extremely "hand wavey". The clay mineral culture idea was only presented as one possibility, but it didn't sound very convincing. If anyone has pointers to more compelling theories, I would be interested in reading them.
I always hated biology / life science in school because most of it was name memorization, but at the molecular biology level, it all starts looking digital...