Beyond just buying or otherwise acquiring these books, I urge you to familiarize yourself with their contents before you need to use them. Trust me on this one. Yet this is precisely how these midnight dramas play themselves out. Most of the accidents in this world take place during the darkness hours. Except involving cats.
Cats see great in the dark.
But people, no. That's much too far to walk with arterial bleeding. Beyond the books. You are going to need some stuff to work with. Not much, but some.