The Fugitive (1963)

Kimble arrives in a small town where women are being murdered by an unknown serial killer and a vigilante mob mistakes Kimble (a stranger in town) of being the killer. Kimble hides out with a mentally retarded young woman named Joanne Mercer, a 'moon child' befriends Kimble and hides him in the basement of her house which is connected by a underground tunnel to a closed-down textile factory where the real killer is hiding out.