A goblin warband has found the secret tunnel which leads from the dwarven keep of Hearth-Home to the nearby hills. The tunnel is intended to be a means of escape if the keep ever falls to attackers, but now it has provided goblins with an easy way into the Underkeep.
So far, the goblins have confined their attentions to the various underground rooms that make up the Underkeep, but sooner or later they will find a way to the surface. They pose a serious threat to Hearth-Home - the goblins must be cleared out of the Underkeep so this breach in security can be repaired before the orcs hear of it and overrun the dwarven keep.
This adventure is slightly more challenging than Red Hand Trail, and it is recommended that it is played after that quest and before Palace of Dread. However, the scenario in Trouble Below can easily be played independently from the rest.
Part of TSR 1076 The Goblin's Lair
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