Kara Gillian is one of my favourite urban fantasy series and this book didn't disappoint. 
 We kick off where the last book ended, with Kara still in the demon realm, but the action soon moves to Earth where the team try to track down abducted Idris. We learn that Rhyzkahl hasn't given up on his plans for Kara and there's more fall-out from the torture scene in the last book. 
 If you can't remember much of the earlier books, I'd highly recommend a reread of the previous book (Touch of the Demon) at the very least before tackling this one. It's not that the book is hard to follow (it isn't, and DR explains important events well enough for those with hazy memories) but I think readers will get more out of the book if recent events are fresh in their minds. The main action is the rescue of Idris, but it's the greater story arc that makes this series so compelling to me. I find Diana Rowland to be an incredibly clever (and sneaky!) author, and there are tiny hints dotted throughout the previous books, and quite a few instances where a random comment from two books ago suddenly becomes important. I love it when authors do this! But never mind the previous books; this one is FULL of teasers! We get more information about the demon lords, their counsellors and their origins, and some juicy background on Kadir, Tessa and Zack. I feel that I want to immediately read the book again to try to figure it all out! 
 DR has said there should be nine books in the series and Book 7, Vengeance of the Demon, should be out in about a year (probably January 2015). I cannot wait!