Domain of the Netherworld

A sudden holiday with his uncle, a trip to Bulgaria for Gods sake!
Chaz Larimore’s world is turned upside down when they meet up with student, Iskra Daskalova at the Magura Caves.
Why did he not listen, before triggering an almighty time-shift into a most shocking and bloodthirsty quest that test their survival skills to the limit, when they find themselves in a primitive yet magical world?