It's more than just YA romance and teenage angst. Lucille is literally trying to keep her little sister fed and clothed and deal with adult responsibilities ALL WHILE HIDING THE FACT FROM EVERY ADULT THAT SHE'S DOING THIS BY HERSELF. You'll find similar themes of "adulting is hard" and "does-he-or-does-he-not-love-me" that resonate in much of YA lit, but holy hell. Life can really, really suck without it literally being the apocalypse. Lucille is a badass and does what needs to be done.
"This Raging Light" packed a punch. It was hopeful and devastating, and yo-yoed me back and forth. I haven't been so emotional reading a book since "The Fault in Our Stars".