From the back of the adventure:
"STOP IN THE NAME OF THE LAW!
An investigation into the theft of an important artifact and the gruesome murder of a museum employee takes the Knights on a hunt for the killer, a man who is no longer entirely in control of his mind.
The artifact, actually a Zal device buried eons ago, flooded the thief’s mind with images. Effectively corrupted, the thief has become a Dark Prophet, convinced
that the Rephaim are mankind’s saviors and will soon make him a god and punish humanity for its collective sins.
Can your heroes find this dangerous psychopath before more damage is done?"