I'm trying to identify a story that I read roughly 12-15 years ago. At the time I read it the book was probably several years old as it was a paperback and, I'm fairly sure, was donated to some sort of charity bin, which I think is where I found it.
I remember very little of the plot, save for some key elements.
The story involved a town, at the centre of which was a well. I believe that the well contained a creature, as I seem to remember it climbing from the well. The creature was, or possibly became later, a large, white, lizard like creature.
I remember that the town was being covered by some form of impenetrable darkness. I also remember a scene where two (or more) characters in a car were trying to escape the town. At one point the lizard creature stood in the middle of the road to block their escape. The author described its height (taller than a man, I think) and, for some reason, its genitals. For some reason this scene has remained with me even though the details of the rest of the book have been forgotten. Read into that what you will.
I don't remember if the encroaching darkness and the creature were linked, but I suspect so. I also can't remember the nature of the creature itself, beyond its general appearance. I don't know, for instance, if it killed anyone, or what its purpose was to the story beyond being a scary monster.
Does anyone recognise this story?
Edit: the moon might have played a part - I seem to remember that the moon traversing the sky over the well had something to do with the creature in it.