Spencer is known for creating realistic characters and stories that focus on families rather than only the relationship between a man and woman. These "ordinary" men and women are warm and vulnerable and are always portrayed sympathetically. Her heroines tend to be a mix of fire and warmth, strength, savvy and soft heartedness who must overcome some sort of adversity, such as pregnancy, divorce, a lengthy separation, the loss of a loved one, and then undergo a catharsis. The stories centre on themes of abiding love, family ties and strength in difficult times.
Her books have been sold to book clubs worldwide, and have been published around the world. Condensed versions of many of her novels have appeared in Reader's Digest and Good Housekeeping.