I don't know if I posted about it before, but I have always wanted to run an adventure set in a library. The following is a sketch of an unusual premise and a possible plot-hook.

How could a single building produce so much strife?

Every 45 years, the bamboo forests which cover the tiny land of Ghanzu bloom, and very soon after come the rats...

Beginning adventurers have a hard time to find the right employment... let us try and help them!

A dangerous beast is loose in the forest.

Does the circus have anything to do with it, and if so can they help catch it?

More to the point, will they admit it?

The evil mage Zarakoth is dead, but with his death the world has gone mad. The aging characters are confronted on all sides by rot, death and decay whilst around them the world regresses rapidly to the stone age. Furthermore, Zarakoth seems to have miraculously not died - and to be more powerful than ever.

The bell calls from its lonely tower, ringing across the valley. For whom does the bell toll, it tolls for thee...

The Elven city of Pulca is under siege by a small chaos clan of beastmen. The General of the beastman is a shaman that is attempting to open a warp gate from the the Choas realm. If by any chance the gate is opened many many choatic deamons and abominations will be turned loose on the grand Elvish City of Pulca.

A siren has seduced a noble overboard and gifted him with watery breath. Now his family is preparing to go to war with the mer-people, blaming them for his kidnapping. They mer-people have beseeched the players to explain that the siren isn't even one of thier people and help rescue the noble from the siren.

Problem is, the noble is now daddy.

The players are diplomats: ambassadors to a distant, unstable realm. The promise of security that came with King Addarron is suddenly shattered by his assassination. The ambassadors are caught up in the ensuing intrigue-riddled politics...

The Duke Wars have torn apart the kingdom. Now, two dukes battle for supremacy. Will the heroes help the ambitious and noble deSandreaux or the beautiful and brave Christine?

Deep within the bowels of the earth, the great structure of reality finds itself at siege.

Two religeous sects are approching open war after members of each sect are found brutally beaten to death.

The war has returned. But now the enemies of the enemy are no longer dwarfs. Men must stand against the host, and to do so they need weapons. The mines of the dwarfs in the Elathon valley must be re-opened, and their fruits mined.

A long forgotten and abandoned mine has been recently rediscovered by a local village.