Blue Smoke by Nora Roberts

Reena Hale grew up with an intimate knowledge of the destructive power of fire. When she was a child, her family’s restaurant was burned to the ground, and the man responsible was sent to jail. The Hale family banded together to rebuild, and Reena found her life’s calling. She trained as a firefighter and then as a cop, always with the end goal in sight: to become an arson investigator. Now, as part of the arson unit, she is called in on a series of suspicious fires that seem to be connected-not just to each other, but to her. And as danger ignites all around her, Reena must rely on experience and instinct to catch a dangerous madman who will not stop until everything she loves has gone up in smoke.