Jonathan Sir, you did a nice job of writing it, your framing and narration were as always soul-touching and good, but what did you do to the plot? It's like, at around 30% of the novel, you pulled the pin of the grenade named 'Plot and Characters' and then it exploded all over the Ruin and then you scrambled all the pieces together as best as you could to get a finished puzzle...well, mostly. I'm hoping the 4th book has some answers to the questions you left openhanded. 
 All in all, it was a good read for the style of Maberry's novels and the setting of this series are worthy of a deep dive. I'm done praising all the good parts of the series over and over again, but still, damn, the characters grew in a very realistic manner. And the novel deals with issues like death very grimly. I so hate religion, man! All kinds. The reapers area a true evil, and a brilliant and novel idea- one that at least I've never seen before. 
 Tom was missed. He should have been there with them all, but I guess that would have kind of stalled the character growth and the realistic plot would have become too cheesy if everything always went fine for our leads at the end. I'll stop and go enjoy the 4th book now, and re-read this book and the whole series for the awesome quotes it has. I've highlighted some on my Kindle, which I'm sure I'll be rereading over and over again.