Having read Obsidian first, I knew what was coming when I started Shadows, but it didn't make it any less sad.
What I loved most about this series is actually getting to learn Dawson, while getting to see another side of Daemon. The boys are pretty much exact opposites, and although Daemon isn't crazy about Dawson's feelings for Bethany, a human girl, he tries to be there for his brother.
Knowing how their story would end, I was sure that when the moment came, it wouldn't be a big shock. Nope. It still was. There's so much emotion in that scene. Add in the final scene between Daemon and Dee? It's definitely an emotional end, whether or not you know about what is in store.
Shadows manages to include Armentrout's humorous lines, most of them coming from Dee. Seriously, the scene between Dawson and Dee in his bedroom? Priceless.
I'm going to keep this short, as this is only a novella, but if you're planning on skip over this prequel, I'd say you're missing out. Yes, you know what to expect. But Shadows is still an emotional ride worth experiencing.