In the affair book, the main characters are usually a married couple and the third person involved in the affair. The husband or wife is often portrayed as someone who feels neglected or unfulfilled in their marriage, leading them to seek emotional or physical connection elsewhere. The third person, often a colleague or an old flame, becomes the catalyst for the affair. The story typically explores the emotional turmoil, guilt, and eventual fallout from the affair, focusing on how it impacts the marriage and the individuals involved. The characters are usually complex, with their own motivations and vulnerabilities, making the narrative more relatable and compelling.