Anything can happen in the dark… Scientist Lacey Delaney has a hard rule: no dating men in the mining industry. And anyway, she'd rather focus on her work—designing a sophisticated piece of equipment for locating trapped miners. But when she finds herself stranded on the side of a Kentucky road and rescued by a drop-dead-gorgeous guy…, well, who's to say her business trip can't have a little pleasure? Then Lacey learns that Cole MacKinnon is a mining engineer. His job is hazardous—and so is getting involved with him beyond a few nights of wickedly hot fun. What Lacey doesn't know is that Cole is actually an undercover federal agent, a job that carries even more risk. And the deeper they go, the more dangerous it will get….