“Never show the monster,” horror film-makers, game-makers and other creepozoids have chanted, over the decades. The Well Is Not Empty wastes no time showing us the monster – one of the monsters, at least – and doesn’t seem especially the worse for it. I mean, it’s the worse, but in a good way. Look, you can see the monster right there, hunkered up like a frightened puppy in the corner of the room.