I ran this at my FLGS today and did so with a single read through. Ran perfectly. It's a slow build and a climactic ending. Sure, there is a small need for a little nudging of the players, but mine (one experienced CoC player, two who have played the quickstep, and three first timers) worked through the clues with very little need for additional guidance. I thought it was an excellent scenario. It is very close in theme to a scenario I have written for Trail of Cthulhu, so I had that as a good background to help me run it.