Hunter, Faith. Soulwood novels.

"Nell Ingram has always known she was different. Since she was a child, she's been able to feel and channel ancient powers from deep within the earth. When she met Jane Yellowrock, her entire life changed, and she was recruited into PsyLED--the Homeland Security division that polices paranormals. But now her newly formed unit is about to take on its toughest case yet. A powerful senator barely survives an assassination attempt that leaves many others dead--and the house he was visiting burns to the ground. Invisible to security cameras, the assassin literally disappears, and Nell's team is called in. As they track a killer they know is more--or less--than human, they unravel a web of dark intrigue and malevolent motives that tests them to their limits and beyond"--Provided by publisher