Five Gold Rings - The Partridge Christmas Series, #5

Grace Montgomery is known as a champion for social justice. She has fought against slavery and child labor. Her latest cause pits her against the railroad threatening the historical integrity of her beloved city of Cambridge. Her involvement in these causes keeps her mind off the one thing she's always wanted: a family. Arthur Gregory has just been offered the crown jewel of his architectural career: designing and overseeing the new railway station in Cambridge.
He and the city fathers have chosen the perfect location in the city's center, but protesters want to stop him, and they're led by the one woman who could derail the entire project. She's also his son's godmother, and he needs her help to keep the youngster out of trouble. He'll need to work both with her and against her, while resisting his growing attraction.