The Singing Stones

Karen and Richard met by chance, strangers in an unfamiliar town. They were used to the good life and each saw fit to take advantage of the other. A weekend of pleasure was their aim as they set off over the Pennines that rainy night. But they took a wrong turning down a confusing, deserted lane. Bogged down in a remote area with no phone signals, they could not call for help. Perhaps there was help to be found when they saw a distant light and to this they were drawn as moths.
But in the depths of night both found they had passed through a portal into hell. What were the horrors they witnessed and how could they ever find freedom as their own dire fate became clear?