Blue Sage by Anne Stuart

Ellie Johnson Lundquist survived the massacre that killed her parents and decimated the town of Morey’s Falls, Montana. Now, with the anniversary of that day putting everyone on edge, someone has walked into town, throwing everything off-balance.
Fifteen years ago Tanner’s father took an arsenal to the town square. A lone wolf, Tanner has spent his life on the road, trying to escape that memory, but now he’s come back, ready to face his father’s past and his own.

Strange things have been happening in town, and Tanner’s an easy target. His presence unsettles everyone, especially Ellie, who’s eager to get him out of her life for good. There’s no way she can be attracted to the son of a killer. No way he could want her.

But as the anniversary of the massacre draws closer it’s starting to look as if history is going to repeat itself. Ellie and Tanner are thrown together in a race against time to find the new killer before history comes back to haunt them and destroy any chance of a future they might have together.