BLOOD BOUND by Rachel Vincent Unbound trilogy

When I first found this trilogy, I was skeptical about how a trilogy is not about the same caracters in all three books. But after reading the first one, Blood Bound and reading the story about the second, I found out exactly what is happening. So in this book (in all three actually) we have to leaders, one on east side and one on the west. But those leaders have their clan bound to them, by blood an with a help of a binder.And if you try refusing what your leader tells you to do, you feel excrusiating pain, your organs start to fail and you eventually die.
Our story is about Olivia. when she was 12 she was bound by Kenley, Kori's little sister by accident. The bout was between her and her three friends to always help each other when one of them asks. So now every time one asks for help, pain and death awaits the other if she sais no. So here we are on the now. Olivia is a tracker. She can find people with their blood. And when her friend asks her to find who murdered her husband, she has to help her. But the bigger problem is that she has to work with Cam, her ex who she walked away from in the past and also a tracker, but he finds people with their names. So loosing blood and saying your whole name is a very bad thing. Especially when you don't want to be found. And especially when you have a skill like Olivia.
One last thing. They also use the help of another of her bound friends, Kori, who is a traveller, a shadowalker, a person who can step from one shadow in one place to a shadow in another. Hold her name and her little sister's, a binder named Kenley, cause you are going to need them on the next book!! But don't worry. You will not get confussed.....much!!!