Dark Tower: The Gunslinger: The Little Sisters of Eluria

Near death from an attack by slow mutants, Roland Deschain is taken in by a group of nuns who specialize in anything but the healing arts. These hideous, corpse-like creatures known as the Little Sisters of Eluria have murder on their twisted minds. And in his current, wounded condition, there's almost nothing the last Gunslinger can do to prevent their tender mercies from taking hold.