Dr. Brett Thornton's latest discovery—an antiaging formula—should have had him set for life. Instead, everyone he meets wants a piece of him. He needs to get away, to clear his head. And he figures a once-in-a-lifetime trip into the wilds of Peru should help him put things into perspective. That is, until a gorgeous fellow tourist messes with his quest…and his libido! Kayla Watson used to like traveling on business. But that was before her boss insisted she spy on scientist Brett Thornton on his trek into the Andes mountains. Now she's tired, dirty…and seriously in lust with sexy Brett. Lucky for her, he encourages—and helps her exercise—that lust. Again and again. But will Brett still want her when he finds out what she's really after?