Yes, there was more to Jack than met the eye. And no, Jack was not a danger to Sharon here and now, nor did he plan on being a danger to her in the future. Unless, of course, she became a danger to him or those he cared about.
Jack returned the woman's warm smile, and leaned back against his chair. "Nothing too out of the ordinary about where I'm from, either. I was in Wales most recently. Working for Torchwood." Though he didn't expect her to know what Torchwood was. Not a lot of people did. "Making sure the planet -- or, well, Wales -- is safe from aliens."