Ultima Underworld: The Stygian Abyss

Many years have passed since your last visit to Britannia. Little did you expect that, when you returned, you would be accused of kidnapping Baron Almric's daughter, Arial - and then be thrown into the Great Abyss, without so much as a chance to prove your innocence.
Only by surviving the dangers of the Abyss and finding the villain who abducted Arial can you restore your good name. But dark hints garnered from all corners of the Abyss reveal that this was no simple kidnapping. The fate of Britannia hangs in the balance as you battle the horrors that lurk as the heart of the Great Stygian Abyss.