The Darkest Angel
This was a great in between story about Lysander and Bianka.
Bianka is Gwen's sister from The Darkest Whisper and Lysander is an angel that kidnaps Bianka to try to make her good.
With most short stories I've read in the middle of some series, the stories tend to be just filler. This one had some depth to it and I can only imagine that these two characters are going to add to the rest of the Lords of the Underworld series. If they are mentioned in the future, it will be nice to know what their story was.