Leads to madness? Dear sir. Until you've contained a person's madness into a dead mouse, ground it, boiled it, distilled it into an elixir of insanity, and have taken enough of it to see the pineapples and the candles within a man's head, all in order to speak to the invisible Faerie who has stolen away your wife, then I have to say you do not yet know what leads down that path.
In any case, I'm looking forward to reading Brief Cases; most stories I've already heard, though I'm looking forward to reading Day One for the first time.