The one thing good thing I can say about Hourglass is that it is easy reading. Even when I wasn't enjoying myself, I could get through the pages. But - honestly - that is the one and only good thing about this book.
Seriously. That's it. But just because the book was readable, that doesn't mean I'd recommend you actually read it. In Hourglass, all the things that had once merely annoyed me about Claudia Gray's series amalgamated into 300+ pages of pure hell.
My problem with this novel - and the entire series, now that I think about it - is that it all revolves around the hideous Lucas/Bianca relationship. And guess what? I would pay money to have both of those characters killed. They are just so utterly and terribly self-involved - hideously self-involved. Every single waking thought that Bianca has revolves around Lucas... and yet, she seems more in love with being in love than she is with him. *spoilers* When Lucas is literally dying in her arms, is she thinking about him? Is she utterly distraught beyond recognition? No. She is comparing herself to Juliet watching Romeo die in her arms... seriously?? *end of spoilers* I mean, people complain about the Twilight series? Seriously? Bella is absolutely nothing compared to Bianca.
And, you know what, that would be fine if this were any other series. But in the Evernight world, Bianca and Lucas being together doesn't just affect them - it affects everyone else too (although, mostly due to their stupidity and inability to form a plan - they could have found a nice island to live on if they had been more with it). Bianca and Lucas will commit crimes and condone murder in order to stay together. And I find that kind of selfishness absolutely loathsome. Your relationship is NOT more important than someone's life. Full stop.
Bottom line? Even hardcore YA Paranormal Romance fans should stay far far away from this series.