Hallowed is the sequel to Unearthly, and I thought it was a really good sequel. It's so compelling, and it was hard to put down. It broke my heart, and made me want to squee while jumping up and down. 
 The Tucker-Clara-Christian love triangle is certainly interesting, and it is surprisingly not boring. I love Tucker and Clara, but Christian and Clara also make a lot of sense. It didn't annoy me, and it's not perfect by any means. But again, it didn't annoy me, so I can't really complain too much about it. 
 Clara's mom was really irritating, with not wanting to tell Clara anything unless she had to. Jeffrey was also irritating, and I couldn't help but wonder what he was up to. It turns out he set one of the fires, because it was his purpose. And in the end, he disappears without a trace. While most of the plot points were resolved, there are a few things that are left untied. 
 As much as I loved the book (and series), I wonder what Clara's purpose really is, and if it will ever be resolved. I can see the series going on for a really long time if Clara keeps resisting her purpose, but hopefully the next book will have a lot more clues. 
 I give it a 5 out of 5. Hand clearly put some thought into the series, and the imagery is beautiful.