I found most of this book somewhat boring. It took me a while to get into the plot-line and the characters, but once I did it was quite an enjoyable read. But, not my favorite of Armentrout's book. Much like the Lux series, I think I'll enjoy it more and more as I get further in.
Alex is a half-blood, forbidden to be in a relationship with a pure blood. Her mother died and know she's left with the covenant. Being trained by Aidan, learning how to fight. Her only real choice, to become a Sentinel. When the unwanted happens and feelings for Aidan rise and secrets become found, Alex finds herself in more danger than she ever imagined.
Definitely not Armentrout's best book and very similar to other series out there. I have heard a lot of good things about the Covenant series so I'm really hoping to completely fall in love with it by book five.