From the publisher
This is a Gothic tale of horror set amid the stark moors and mires of Dartmoor, under the shadow of the prison. The story of a family cursed by a demonic hound that literally hunts them down is at first dismissed as a 'fairy tale' by Holmes. But when Sir Charles Baskerville is found dead on the moor, the doctor sees something nearby: 'Mr Holmes, they were the footprints of a gigantic hound'.

iblist.com user synopsis
When the body of Sir Charles Baskerville is found in the garden of his ancestral seat, it looks like the curse on that unhappy family has struck once more. Dr Mortimore, a friend of the family visits Baker Street in order to enlist the help of Holmes and Watson in ensuring the safety of the heir, a Canadian who has come over to take his place in the Hall.

Unusually, Holmes begs off going down to Devonshire immediately, pleading unfinished business, but enjoins Watson to defend Sir Henry to the best of his ability. Watson finds the moors in uproar, with the police after a desperate escapee from Broadmoor, a beautiful woman taking an interest in her new neighbor, and a strange watcher looking over the moors.