Jubal has made it clear. In three days deliver the one among you who betrayed the Hawkmasks or all must die. In a race against time you must find which of you is the traitor and recover a valuable document. Traitor is an adventure in Sanctuary, the city of Thieves' World anthologies edited by Robert Asprin. Traitor includes a detailed adventure, dozens of new characters, maps, and locations for Sanctuary, and Gaming Jubal by Robert Asprin.
from the copyright page:
Selected materials in this adventure are used under license from Chaosium Inc.