Gin has been busy the last few weeks after she finally took down Mab Monroe (Hey I'm not spoiling you, points up to the book summary). Every scum bag in Ashland that's trying to make a name for themselves has been trying to take out the Spider. Gin is sick of the constant death threats...yeah right, they're not really threats since she kills all the lowlifes that is too stupid not to learn from other's mistakes. Come on, the Spider was the only one that could kill the big bad fire elemental, Mab Monroe and you think that you can take her out with your pea shooter. Please! Then you are too stupid to live. 
 Gin realizes that the attacks are not going to stop anytime soon, so she finally agrees to take that vacation that Finn suggested to her. What could go wrong when Gin decides to go on a short weekend getaway? A fun road trip with her little sister, Bria? The Snow sisters make Thelma and Louise look like a Disney flick. 
 Gin takes her assassin show on the road in By a Thread. Hoping to have a little sister time with Bria the two drive down to the beach getaway a day earlier than Finn and Owen since the boys had business to wrap up. Gin really tries to relax on her first ever vacation, but she doesn't know how to enjoy a vacation like "normal" people. She tries to do the tourist thing with Bria but that doesn't last long. 
 Bria picked the vacation spot, the place she grew up after the death of hers and Gin's mother and older sister. Bria takes the chance to catch up with her best friend. Gin tags along to get Bria's BFF, Callie. But feels left-out and comes off a little bitchy to Callie at first. But then that's when a local thug comes into Callie's restaurant to threaten her. Yeah, Callie is the friend that Gin reminds her of...she runs her own restaurant and she happens to look a lot like Gin..... (wait for it) 
 So Gin steps in to help Bria's friend with the thug. But little did Gin know that the thug is a low man on the totem pole that works for the big bad guy in town who happens to be a vampire. Now up to this point in the series vampires have been around but we get the low down on Estep's version of the creatures in By a Thread. They are just like humans expect they need blood along with regular food. If they drink from an elemental they get that person's power for a short time and they live for a long time. 
 So this vampire has a few tricks up his sleeve and he's not as easy to kill as Gin first thought. Killing Mab might have made Gin a little too cocky and she quickly rethinks her approach to killing the bastard. And he's a real bastard but I won't going into too much deals. 
 Remember when I said to "wait for it" (points to earlier paragraph about Callie's similarity to Gin). Well hello Mr. Dick-tective Douche Bag. That's right, if you couldn't tell by the book summary, Donovan is back. It just so happens that Bria took his spot on the Ashland police department and he took hers when he left town. And what has that self righteous prick been doing? Getting engaged to the safe version of Gin, Callie. That's right Gin's ex-lover is engaged to her baby sister's BFF who happens to look a lot like Gin. Mmm.... 
 And things only get more awkward when Finn and Owen finally make it into town. 
 Need less to say By a Thread is full of bloody good times and wrapping up a few loose ends in Gin's love life.