Grief and Guilt--two of the most powerful of our emotions--are the drivers in Almost Forever: A Hanover Falls Novel by Deborah Raney. Bryn is a volunteer at a homeless shelter, and is there one night when her husband was working late as a firefighter, despite the fact that he didn't want her there. A fire starts and by the time the night is over, the homeless shelter is destroyed and Bryn's husband and four other firefighters are dead. For reasons that become clear in the book, Bryn feels guilty about the fire, and has to deal with the guilt along with the grief any normal young widow would feel. She becomes close friends with Garrett, whose wife was one of the firefighters who died with her husband, but I definitely wouldn't call this a romance novel.
Almost Forever: A Hanover Falls Novel is Christian fiction. The top of the story arc is a religious experience had by Bryn and the resolution involves an innocent man offering himself for the guilty and a realization that we are all guilty. I guess I'd classify the book as well-written Christian fiction with an obvious message. I enjoyed the book and believe most readers of Christian fiction will like it too.
You can learn more about the author, Deborah Raney at her website.