The Stars are Fire by Anita Shreve

Grace, a young woman with two small children, lives by the coast of Maine in 1947. Her marriage isn't very happy, but she's dutiful and devoted to her children. After escaping a devastating fire that wiped out her town and nearby forests, Grace has to become braver, stronger, and more resourceful than she's ever had to be before. She manages, until something unexpected makes her life contract once more. Read a sample.