Part of TSR 1076 The Goblin's Lair

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

Agents for the Mayor of Kleine have discovered the stronghold of the Red Hand goblins deep within the Burning Hills. They have also discovered that the goblins are forming an alliance with local hobgoblin and bugbear tribes to sweep the humans out of Thunder Rift forever. The PCs must reach the lair before the hobgoblin and bugbear agents return to their own tribes. if the envoys do not return, the tribes will assume that the goblins murdered them and attack the goblins instead of the human settlements. In this way, the humans of Thunder Rift gain some unexpected allies against the Red Hand goblins. This is the most dangerous and demanding of the three adventures in this set. It is recommended that you play it after Red Hand Trail and Trouble Below. However, it can stand alone as an adventure in its own right if you wish. Part of TSR 1076 The Goblin's Lair