Publisher's blurb: As the Zhentarim slowly reoccupy the Citadel of the Raven, they continue to explore the tunnels under the mountain one level at a time. Three tendays ago, a new section of the tunnels broke open, and the first group exploring did not come out. Neither did the second. Nor the third. Unwilling to risk their necks any further, the Zhentarim turn to the other factions for aid in figuring out what threat lies beneath the mountain. A four hour adventure for 5th- 10th level characters.