You see them everywhere, especially places where the mortals walk most. The Secret People all have something to hide - they are cloaked head to toe, some with their hoods covering their faces, some their glasses covering their eyes. You will never know them, not really - many don't even have enough power to give themselves a name, and those that do may well not tell you it. They may not even speak at all, but they have so many secrets to tell.
If you reveal their secret - the one on their face - you take the mask off, you pull back the hood, you tear off the glasses - you'll find nothing there behind it. A Secret is not a Secret once you know it after all, and such an act often can kill the most feeble of these creatures.