There is virtually no point saying that I love Seanan McGuire to bits. Every damn book of hers I read ends up with high marks. For me she is everything urban fantasy genre should strive to: high octane plot driven story, strong characters and an in depth world-building.
She has it all and she makes every book better and better than the previous one.
After heartbreaking ending of book #5 Toby Day has a short period of quiet before the storm so she can grieve. However, she gets a plea for help from the last person she would have expected to mess up, and what looks like a simple mission turns into save-the-world-try-not-to-die-in-the-process affair. Her usual type.
Not only that, the circumstances are eery similar to what happened to Toby's own daughter, and she is forced to deal with her emotional issues and her attraction to Tybalt as well. So you can say that book #6 is a turning point as it's full of revelations.
The plot is incredibly intense because Toby and Tybalt are both forced to jump between fae dimensions to find a missing girl who wreaks havoc in fae worlds and is unable to stop on her own. By doing that she is wearing off the foundations of fae magic, which holds everything together, and Toby has to stop her if she wants the world to stay as it is.
It's a fantastic read which I devoured in one go. I highly recommend this book and all the other books in the series to any fan of urban fantasy or anyone wanting to try and read something in this genre.