It was fun to read. Eve is one of my favorite characters, possibly my favorite of the series. I appreciate the shades of gray that she and Kristof Nast bring in. The humor is strong in this installment. I particularly enjoyed the conversation in which Kristof explained his role of the hero's girlfriend. Yes, you did read that right.
This story is also meant to be important to Eve's character development, in which she really accepts her role as an angel, despite the way she is frequently jerked around by the Fates.
It would've been nice to see Trsiel. But this was just a novella, and it's worth reading if you're a fan of the series. If you're new to it, I wouldn't personally start here. I'd start at the beginning, with Bitten. Enjoy.