Sharper Than a Serpent's Tooth (Nightside, Book 6) is probably my least favorite book of the Nightside series. The three previous books lead up to the Lilith War. In this book Lilith has returned to Nightside and she doesn't like what she sees.
John Taylor spends most of the book either lost in time or hiding from Lilith. We see most of what Lilith does through the memories of people and magic mirrors. There's a lot of carnage but the deaths and destruction don't seem real because we're seeing most of it second hand.
Most of the book goes by at a snail's pace until the last couple of chapters and then everything speeds up. It's as if Green realized his book was getting long and decided to wrap everything up in as few pages as possible.
At one point, Taylor is saved from Lilith's wrath by a deus ex machina in the form of The Collector. Deus ex machinas are a pet peeve for me but I just found it really weird to suddenly bring another character into the story.
There's a theme running through this book about the legacy you get from your ancestors. John discovers his talent comes directly from Lilith and she had a purpose behind the gift. Another theme shows how the family you choose (friends) can be much closer and more important than any genetic relationship.
I don't know where the series is going to go now. So many story lines are wrapped up in this book and many characters are dead. I just hope the next book has a more even pacing.