An ancient feud between two powerful families is the cause of an assassination plot against a young Rankan noble. You have to stop it. The only problem is that the weapon to be used is a magically created monster. Dark Assassin is an adventure in Sanctuary, the city of Thieves' World. This booklet includes a detailed adventure, new characters, maps, locations for Sanctuary, and Gaming Sanctuary by Robert Asprin.
from the copyright page:
Selected materials in this adventure are used under license from Chaosium Inc.