Publisher's blurb: The city of Lygos is in great danger and none of citizens knows it! The Silent Fang, an organization made up of the serpent-like yuan-ti has infiltrated Lygos and seized the city's highest positions of power. Its members await an eclipse to signal them to unleash mass-slaughter upon the city! This adventure is designed for four 8th-level characters. It contains background notes on the Silent Fang and its goals and leaders, city-based encounters to be used in any combination and order, a laboratory-themed dungeon, a map to said dungeon, and a bestiary containing combat statistics for all monsters in the adventure.