Dominoes: 3 Conan the Barbarian - Robert E. Howard

When Conan the Barbarian follows Valeria the Pirate south, he surprises her. Together they escape from a fierce dragon, and enter a strange city in the desert, looking for treasure. Two enemy clans live there, and Conan and Valeria are soon asked to join in the war between them. This adventure story - full of battles, magic, and terrible monsters - is about two friendly fighters. But who are their enemies? And what is the secret of the black pillar with the red nails in it?