Monday night I was at a gig and didn't get to sleep until 4am. Last night then, I went to bed at eleven and couldn't sleep for 3 hours. This means I now have almost the entire plot worked out, but I'm so tired I can't be arsed to type it up. (Up at 6 this morning for work
)
I don't think I'll need to do much more reverse-engineering. Probably looking at 12 - 20 chapters in total, with Vikings, Mafia, a brewery-based conspiracy theory and a big big big big gap for a sequel, (but without making this story in any way dependant on the next.)