Happy Blood Alter Ring to You

Ned's mother wants a 35 carat "Goldina" ring for her birthday, but Newton just insists it's a "cheap replica" of a sacrifice ring used by a group of Peruvian savages called the "Jajamojos". Ned and Newton go to Peru to get the ring, and brave the dangers of a temple full of booby traps, and escape being thrown in a volcano.