You are beginning to write Chapter Six.
Before you start to type, you ask yourself how the chapter fits into your overall plot. What do you want to include? How should the chapter begin?
But, if you do know how you want the chapter to end, try this:
Start at the end (the part you do know) and write backwards until you get to the beginning scene of the chapter.
Even if you’re not stuck, you may find this to be a great exercise. You will be forced to focus on exactly where you want to take the reader—from point A (beginning scene) to point B (the cliffhanger that makes them want to read more).
Sometimes simply getting a visual of where you want to end will inspire you to write a stellar beginning.