No Time for Christmas — Barbara Goodwin

This is Book 3 in the Love Beyond Time series, but may be read as a standalone story. After losing his wife to a car accident one Christmas season, Joshua Forrester buries his grief in work. Twenty years later, and still alone, Joshua is addicted to everything electronic. As he steps out of his condo one morning he's shocked to find he's in 1890. His Blackberry doesn't work, there's no electricity, and his hometown of Sisters, Oregon, looks like a Hollywood movie set from the Wild West days. But this is no movie. Adeline Benjamin, the beautiful town spinster, takes him under her wing when he's thrown in jail for counterfeiting money dated 1980. Joshua is instantly attracted to Addie. Heat burns through him every time he's near her, but he gains a powerful enemy because of his attraction. And he needs to find a way to make a living in a time he never thought he'd see.