A great Evil has settled across the land. It is a plague that no healing can stop. Some call it the wrath of the unworshipped God, as no cleric of a worshipped god can effect it. The midwives, herbalists, and quacks have had some success in reducing the suffering of the people effect, but soon it will destroy the Land.
A sage of your acquaintance thinks he have a solution. This has happened before and was stopped. He has found several obsucre references to an older tome of healing. The Tome of Klorac. However, all copies were destroyed a centuries ago, as the clerics call him a heretic. One copy might remain. It is in one of the royal palace libraries. Unfortunately it is in the lost city of Asylum (see setting entry).
Now you must sneak into the city of the Mad, through the armed garrison. You must survive the mad that waunder the streets of Asylum. (Did anyone mention to you that they are superhumanly strong and immune to pain?) You must escape over the wall in which an army unit stands to stop any from crossing the wall. It is nearly impossible. Yet, if you don’t the Land is lost.