Action vs Surprise
I may be showing my age here but when I was a child, I would take great delight in watching the Mission Impossible TV series with all its twists and turns, skeleton masks and mock rooms. The spies involved were sophisticated, clever and incredibly laid back. No one seemed to run anywhere. Their plans were so well planned and timed that each action slotted into the next with apparent ease. Nowadays I would probably be able to predict what was going to happen in most episodes but back then, when audience expectations were different and I was a child, their schemes were genius. Excitement in books is often equated to action - a fight, a chase, a death defying leap - and it is true that action can help to maintain pace. As a reader, as well as a writer, I enjoy the thrill of a heart wrenching escape as much as anyone. However, there is one other element that can occasionally work just as well. Surprise your reader. Throw something into the mix that they could never have dreamt...