Not that I'm aware of. Stephen King has written many novels, but 'A Town Called Mercy' doesn't ring a bell. Maybe it's a lesser-known work or a title you might have gotten slightly wrong.
Well, if Stephen King were to write a novel titled 'A Town Called Mercy', it could center around a town that has a false sense of security. Given King's style, there could be an otherworldly entity lurking in the shadows. The town's name 'Mercy' could be ironic, as there is no mercy shown by the evil that haunts it. There might be a group of characters trying to uncover the truth about the town's past, which is somehow linked to the current terrors.
It's hard to pinpoint a single town as the base for all of Stephen King's novels. His stories are set in a diverse range of fictional locations, each with its own unique characteristics and atmosphere.
Castle Rock has its own brand of terror. There are so many strange and often violent events that occur there. It has a prison which adds to the sense of danger. And the fact that the town seems to have its own malevolent force at work, whether it's a supernatural being or just the collective darkness of its inhabitants, makes it a truly terrifying fictional town in Stephen King's works.
The fictional towns usually have a strong sense of community, but it's a double - edged sword. In a town like Jerusalem's Lot from 'Salem's Lot', the community is tight - knit. However, this closeness makes it easier for the vampire to infiltrate and spread its evil. The towns also tend to have a past that haunts them, whether it's a long - forgotten murder or some kind of ancient curse.