Fast Burn by Lori Foster is the Fourth book in the Body Armor series. This is the story of Brand Berry and Sahara Silver. I haven't yet read the previous books in this series, so for me it was a standalone book.
Sahara is the boss at the Body Armor Bodyguard Agency after her brother is missing an presumed that he has died. Sahara has been trying to get Brand to join her agency but he is more interested in her and doesn't mix pleasure with business. But Shara is more into the business but when she is kidnapped by people who are looking for her brother... Brand steps up to the plate.
This was a really exciting hot read that was hard to put down!