The Resurrection of Childra-fen

From the publisher's website:

This adventure continues on in the series, and is designed to take same low-level characters through an evil-controlled province where they are needed to gain the trust of the locals. Making sure to not to be discovered by the vampires until they have reached a high enough level to deal with them without being killed. After discovering the truth about the various people they previously met, they finally confront the evil that lies at the end of the module in the mountain keep, a Lich!