Incandescent

Anna Johnson is tormented with guilt after her best friend is injured in a house fire the night of her birthday party. Then her father's car catches fire at a traffic light. Were the blazes accidental or, as Anna believes, were they set on purpose?
Is there an arsonist loose in the quiet town of Eaton?
State Fire Inspector Aaron Tahir, an arrogant and overbearing man with a dark past, wants answers. That is, until he discovers he wants something more tangible ~ Anna.
Sparks fly from their first meeting and it isn't long before they're afire.

Incandescent is the first in the Secrets of Eaton: When Love Speaks contemporary romance series. Here's a review by Rebecca Wheeler from Amazon:

Great Mystery Romance!
I really enjoyed this!! This was a great fast read, that really gripped me from the first chapter, and I had trouble putting it down until the final page, which I read with the biggest smile on my face!! This book, is essentially a mystery romance, PG rated on the romance. The mystery stars front and foremost, with a lovely romance forming on the side. It is obvious (she) has done a lot of research on the subject matter, which is well appreciated. Although part of a trilogy, this book can be read in any order as a standalone without having read any other books in either of the Eaton trilogies. There aren't any real interconnecting characters like previous books.
I have been a fan of this author's Women of Eaton trilogy, which are fantastic fast reads, filled with real, well written characters, and scorching hot sexy romances. This spinoff series, Secrets of a Eaton, seems to be taking a new direction of mystery romance. The previous book one, Consequences, was a gorgeous second chance romance with mature characters, with a murder mystery as a secondary storyline. I loved it!! Loved the ending (huge smile on face!!). Great mystery, and will be reading more from this author.