Kori is a Traveler, she is able to walk into any shadow and go where ever she wants that is within her range. The skills in this series vary and are much sought after by syndicates. There are Blinders who are able to draw shadows (darkness). Healers, which are pretty much self explanatory, they are able to heal. And there are also binders, who are able to make contracts between people that if broken can lead to pain/death.
Kori is recovering after being tortured and asked to prove herself by recruiting someone into the syndicate. With little choice she meets Ian, a Blinder with significant power. The syndicate's leader, Jake Tower, tells her to do anything to recruit him. Being the rebel that Kori is, this means she shows Ian all the negative things about being part of a syndicate so he will make an informed decision. Little does she know that Ian has an ulterior motive.
The book legitimately made me pissed off for Kori. She was tortured, and treated like crap and I felt really bad for her. I found Kori to be an interesting character and made me want to read more. The writing is amazing, as usual for a Rachel Vincent novel. If you have enjoyed any of her previous work I highly suggest you read this series. If you haven't read a Rachel Vincent book, do yourself a favor and go buy one now!