“Romance” is a rather formulaic genre, with a hero and a heroine, an obstacle to their relationship that must be overcome, and a happy ending. The happy ending isn’t negotiable and, in the trade, it’s knows as HEA or “Happily Ever After.”
In Book 1, Fool Me Once, there’s a hero and a heroine and a relationship with an obstacle all right, but HEA isn’t looking so good until the very end, when there’s a surprise. Actually, two surprises. And an unusual member of the wedding party, dressed for the occasion.
In Book 2, A Bitter Wind Blows, the hero and heroine carry over from Book 1 but the relationship develops between two lesser characters. They seem to be headed for HEA until…ta da…the obstacle, so no wedding party in Book 2 (although it does end well for all concerned).
In Book 3, Signs of Life, the wedding occurs fairly early in the story…and no one is dressed for the occasion, unless you consider oilskins and Sou’wester hats appropriate attire. (Eloping is one way to deal with the obstacle). There’s “very unhappy” at the beginning, happier and even happy for a while, then the obstacle, followed by HEA.