Usually I begin a story and it tends to go chronologically from the first page to the end. Usually. But there are times when the front door refuses to open. Those are the times when I have to go in search of open windows and unlatched back doors.
I find I'm at one of those places now with WHIRLPOOL. Since I couldn't get purchase on the new opening, I spent the last day or two writing up notes and allowing them to trigger scenes and snippets of scenes. A rash of dialogue here; a break-neck speed scene there. It's not a neat and clean, tidy way to write but it works.
Drop by my blog on writing and publishing at Down the Writer's Path.