Welcome to the Caves of Chaos.

Fate brought your group of adventures together. Each person has their own reasons to be there. There is Alazar, the elf wizard; John, the Human cleric of Pelor; and Sam, the dwarven fighter. In a nearby village, your small group of adventurers is hired to investigate a recent increase in the number of raids occurring in outlying farms and homes. Your goal is to discover the reason for the raids and find a way to stop them.

After that, take a look at your wiki. There is some more helpful info there.

http://www.obsidianportal.com/campaigns/caves-of-chaos-playtest0607/previews