The Promise of Home — Kathryn Springer

As temporary guardian of her sister's two children, big-city magazine columnist Jenna Gardner is forced to face her past. She isn't in Mirror Lake for long before she realizes that everything has changed. And it's not her past throwing her off-kilter now -- it's handsome next-door neighbor, Dev McGuire. Though Dev gets under her skin, he quickly proves himself an excellent father figure for the children. Soon he's encouraging Jenna to believe in second chances. But it'll take a leap of faith to believe that her future just might be in Mirror Lake after all.

Note: There's a surprise twist in this story, connecting it to a previous book from another series, "Family Treasures."