A Dead Man's Party

From the introduction: A mad necromancer imprisoned in a sanitarium has died. Now he has come back as a powerful undead wizard. His lunacy was only increased by his death and he has turned all the other inmates into his undead servants. Now the sanitarium is under his control. A traveling group of adventures must put a stop to the necromancer before his evil madness spreads. User summary: For four characters of 4th - 6th level