Likely Suspects (Alexis Parker, Book 1) by G.K. Parks

She's a private detective. He's a hotshot executive. Will they survive each other long enough to stop a killer?

Alexis Parker was a rising star at the FBI, but after a mission went south, she resigned. Now she needs a job. But she only knows how to do one thing - solve crimes. And this one's a doozy.

Someone wants to kill James Martin. The handsome, playboy CEO has a target on his back, and he needs Alex's help. But this case might be more than she can handle.

The hunt for clues uncovers a conspiracy inside Martin Technologies, but before Alex can determine who is responsible, an explosion wracks the office building. She's getting close. Too close. And the killer wants her to stop.

Now bodies are dropping, and the game has changed. Alex must rely on her training and instincts to keep Martin safe, but that might not be enough. With the support of her former colleagues and a police detective she meets along the way, Alex leads an investigation that will forever change the course of her life.