Without belaboring the main conflict of the book (You broke my heart and now I have to trust you! We are only pretending to be married, why do I feel this way? You are responsible for my brother’s death and now you have to protect me!), it is important that the fundamental reason why this couple is all wrong for each other should be evident in every chapter of a romance novel. Whether it’s through a dialogue exchange, the way a situation unfolds, or something observed by the characters, the conflict should cause an undercurrent of trouble in every scene. If that disappears, so does the tension in your story.