My all time favourite series has to be - "The Great and Terrible" by Chris Stewart.
I honestly cannot get enough of this series. It's not like the usual book series that I talk about or fangirl over, because this one is so special to me. In a brief summary, this book follows a family in the Pre-existence as they choose which side - Satan, or Jesus Christ. As they make their decisions, and are sent to Earth to live separate lives, you see how their personalities and desires affect them in the mortal life that they lead, and how everything works out.
I was given this as a recommendation by my Uncle, and instead of just getting one of the books, I bought the entire series and had it shipped from America. #Hardcorethuglifebookworm.
I then got sick (As I suspiciously always do right before I get massive book series...) and got to read the entire thing in about a week or two. It completely blew my mind. There were times where I just put the book down that I was reading and really reflect and think about it and it just..it was astonishingly beautiful.
My only thing was that it was very war orientated. Sometimes it would go oN AND ON for pages about war related and I found myself skimming and yawning whenever they mentioned the strategies or type of war planes.
Other than that. I shipped everything. I cried internally over everything :D I LOVE THIS SERIES!