What an interesting good read! 
 This world that Victoria has created blew me away! WHERE DOES SHE COME UP WITH THESE IDEAS! She's such a great writer. 
 It was so confusing at first but after a while I got it. But I think the only reason why it was confusing was because the world was so different from most books I've read. 
 Basically, there's Keepers, Crews, & Librarians! They all work with the Archived which is where the dead go to rest--they become Histories. The Archived, in my head is like a HUUUUUGE library of dead people (Ha, Doctor Who, anyone?) then there's the Narrows & the Outer. The Outer is where we live, the living people. And the Narrows is where the Histories sometimes escape to! I pictured that as a scary dark hall full of corridors and doors! So Keepers guard the Narrows. The Crew guard the Outer, and the Librarians guard the Archived, in the library place. 
 And there's this huge thing with Doors and them leading to different places but tbqh I didn't really grasp that as much! So I won't be explaining that lol I just know some doors are good and some are bad and you need a key at all times >.< 
 (Also, I can picture this book on the screen! That would be amazing. Some of those scenes in the Narrow would be great.) 
 I'm really excited to read the second one. To find out more about Mac, Wesley (omg hot baby!), Roland (I like you very much, sir!) and the rest of the world!