The 'Complete Works of Gilbert Parker' is a compilation, not a single narrative book. It encompasses a wide range of Parker's writings, including novels, short stories, plays, and essays. His novels frequently revolve around historical events and figures, crime and detective stories, and explorations of social change and personal dilemmas within the established hierarchies of his time. He often focused on themes like justice, the conflict between duty and desire, social mobility, and the complexities of human nature. While known for his flair for melodrama and suspense, his works also delve into social commentary and psychological depth, reflecting the concerns of his era.