I think showing pacing is crucial. Back when I first started, two editors told me to use the jacket synopsis on the cover of a published novel as a model. The inside jack synopsis of a hardcover novel usually works best.
That is a synopsis the publisher uses to sell readers the novel. It shows the overall story, but does so in a vibrant, exciting way that reveals pace, character, plot, and more.
The only real difference is that your synopsis should reveal the ending. It takes some practice to get it right, to use good, vibrant language without being over the top, but I've sold a lot of writing with synopsis just like this.