I can't recommend this series enough. This book is one that I have been looking forward to reading since I finished Venom in January and it doesn't dissapoint. I will try really hard to keep all spoilers out of this review.Gin is back and as we know from the book blurb Elektra LaFleur, another assassin, is in town to kill her. Mab Monroe wants the Spider dead for foiling her plans and killing her people. 
 I felt this book mainly focused on Gin's relationships. While we've seen focus put on her relationships with Finn and the Devereaux sisters in the previous books this one focuses on Owen and Bria. I can't tell you how much I like Owen for Gin (especially when compared to Caine). And in this book we see Gin struggling with basically her heart. She doesn't feel like she deserves Owen and she also feels like any moment he's going to look at her in that disgusted way the Caine used to and end the relationship. I really liked the moments between these two I thought that they were well written. We get to see a softer side of Gin when she's dealing with Owen and we get to see his patience and caring for Gin. 
 The other relationship focus is of course Bria. Since the end of the first novel Gin has known that her sister is alive. Now that she's back in her life (although Bria doesn't know that) Gin has struggled with wanting to tell her who she is, but also knows that she's an assassin that Bria is looking for. It's a complicated situation, but Jennifer Estep writes it all very well. We do see progress on this point in the book and I'm glad that the storyline didn't drag out, or didn't come at the end of the series (which as of right now is book 5 I believe). Hopefully we will continue to get to see their relationship grow. 
 Gin really seemed to grow in this book. She understands the road ahead will be difficult and one that she may not survive. in the past I would say this would keep her from forming any true bonds with people, but now she understands the risks but I think she also knows that having those bonds also helps her survive. Gives her something to live for. I like that she doesn't shy away from her feelings just because she doesn't know how that fight with LaFleur (and ultimately Mab) will end. 
 I can't wait for the 5th book. As far as I know now it's supposed to be the last in the series. I could definitely see this series continuing and i would like it to as well. But the 5th book will surely give us the closure with the Mab story arc. After that, who knows where it could go. Until Then!