"Red Nails" by Robert E. Howard is a novella serialized in Weird Tales magazine from July to October 1936. It follows Conan the Cimmerian and warrior Valeria as they discover Xuchotl, a mysterious jade city enclosed by an emerald dome. The city's remaining inhabitants are locked in a deadly blood feud that has consumed their civilization for generations. As Conan and Valeria become entangled in ancient rivalries, sorcery, and betrayal, they must navigate a decaying world where survival means confronting both human treachery and supernatural forces. (This is an automatically generated summary.)