A missing mage...
A ruthless band of kidnappers...
A sinister conspiracy...
Night Below, the first epic campaign adventure for the AD&D game, is designed to take the player characters from 1st level to 10th level and beyond. The PCs start as beginning adventures on a routine courier mission who soon become drawn into combating a sinister plot that menaces the pleasant land of Haranshire.
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MacMonk has played this adventure and would recommend it.
I converted this to 5th edition which was rough but isn't too difficult with Kobold Fight Club to help. The story was well written and interesting. I can only speak on the adventure up until the beginning of the Garlstone Mine. The town is intentionally sparse in resources which makes it easier for the DM but also easier for the players to stay on track. The 3 different parts of this module are easily dropped into any campaign just with some name changes and encounter conversion.