I've been reading Noah Lukeman's The Plot Thickens and especially liked his chapter on creating suspense and how to do it. He outlines 12 ways that I can't tell you because I doubt he'd like me giving that info away. He'd probably prefer you to get the book. If you're a fiction writer, I'd say it's worth the purchase if for nothing than to read through his chapters on suspense and conflict.
But I did want to share his definition of what suspense is because I thought it was a good explanation:
Suspense, ultimately, is about anticipation. It is about what we do notIf you're writing fiction, how can you add suspense to the page? How can you prolong something for your characters-- and hence, your reader-- thereby building suspense? Add that element, and you will keep readers turning the pages all the way to the end.
have, what has not happened. It is about the process of
watching events unfold. Once the victim is murdered, the woman wooed, the
suspense disappears. But while the victim is stalked, the girl courted, suspense
looms. Suspense, simply, is about creating and prolonging anticipation.
My favorite reader letter to get isn't the one from the person who tells me they bought the book... but that they finished it. That is when I know I did my job.