The Hound of the Baskervilles

Arguably the most famous Sherlock Holmes story by Sir Arthur Conan Doyle.
Dr Watson is sent by Holmes to the wilds of Dartmoor to protect the young Sir Henry Baskerville, heir to a substantial fortune but also threatened by
the historic Baskerville curse. Are supernatural powers at work in the shape of a diabolical hound? Or does a criminal hand lay behind the mystery?
And why does Sherlock Holmes not leave London to assist Watson?
Here is the first in the Complete Sherlock Holmes read by Simon Hester