Temple of Lost Souls

From the publisher's website:

This adventure is designed to take 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. They also have to discover the hidden temple and solve its mysteries and learn the truth about the various people they meet along the way, until finally they confront the evil that lies at the end of the module.