Here’s a quote from Orson Scott Card, the author of Ender’s Game:
So as you look at your bogged down first draft, look to see how much of your effort is spent on withholding information, and then examine whether your reader has any reason to care about what’s going on as long as that information is withheld. Most novice writers imagine that this is how suspense is created–by hodling back key information from the reader. But that is not so. Suspense comes from having almost all the information–enough information that the audience is emotionally involved and cares very much about that tiny bit of information left unrevealed.
Usually the only information that you withhold is this: what is going to happen next.
–Orson Scott Card. How to Write Science Fiction and Fantasy, p. 85.