After a kiss with a mysterious stranger gets out of control, sensible academic Sierra Gibbs is both frightened and excited by what security specialist Ryder Kane does to her.

When Ryder seduces her on her cell phone, Sierra experiences something even more shockingly sinful. And she wants that kind of thrill again...and again.

Sierra knows Ryder would make the perfect sex partner. His line of work requires him to be daring and impulsive – exactly what she wants in bed.

But when she gets caught in the middle of the dangerous case he's working on, even the bold new Sierra isn't sure she can handle a man like Ryder. That is, until Ryder starts calling in some favours of his own...