It should start out slow but the tension should build incrementally to a simmering boil until the climax where it should … climax. I’ve made some notes and know where I need to work it in. It shouldn’t hit you in the face, but be a subtle increase until you can feel it as the reader.
I’ve also been thinking about the follow-on stories. Once I print this, I can’t really go back and change it to make it fit the story arc better (well I could if I self-pub this but that is not how I’m going to roll), so I’m trying to figure that stuff out now so I can bring in some foreshadowing or more importantly make sure the right characters are following a story arc. I’m not an outliner normally but I can definitely see the need for it, especially for a series of books where you have overlapping characters and an overarching story arc that needs to be built in. I’m making progress on both fronts, revising/editing and developing the plotline for books two and three. There’s lots of lines of backstory on the cutting room floor.