This book was great like Nightshade (the first book in the series). Wolfsbane focuses on Calla and Shay and the group they've joined with at first. In getting to know the new characters I laughed out loud a lot, which I don't normally do at the relationships that some of the characters had/formed with each other. We see Calla go through a lot to save her friends and family but we also see loss as well and how it affects her and the other characters through her eyes.
Shay doesn't really have a huge role to play in this book but I think the third book will be focused more on him again, as the first book was. Ren wasn't featured much in this book either, which I was grateful for. The small bit that he was present for he wasn't nice in but that was a small part of the main plot of the story so I forgave that.
Shay is still the main love interest for Calla, although Calla wonders what would have happened if she'd stayed with Shay throughout the book. I found this slightly annoying up until the end where Calla finally does realise who she loves and wants to be with.
The end of the book sees Calla and another character go to find Ren to tell him a truth that's been hidden purposefully from him his whole life and with him they might be able to save the world from devastation.
I enjoyed the magic that took place in Wolfsbane. One of the characters is a "weaver" so she can open doors to anywhere a person wants to go. The characters had to move the building where they were staying to Italy to avoid the evil Keepers. This happened through weaving. Also the weaver saved Calla, the searchers (the group battling for good) and most of the wolves of Calla's pack from the searchers through weaving as well. I've only read one other book before in which weaving happens so I think it's quite unique.
I know that some middle books in YA trilogies (which is what this series is) fall into second book syndrome. I didn't find this book slow at all, surprisingly. Again I would place this book at a slightly older level (15+) as some of the situations and emotions handled might be a little tough to handle for younger readers.
Overall then I give this book a 4.75 out of 5 stars because the only slight fault I had with it was that not all of the characters were present for the main battle scene. Although this will happen in the final book I'm sure.