Sherlock Holmes has received a call for help from an old friend. The Reverend Barring-Gould, noted parson and folklorist, wants Holmes to investigate some strange sightings. When Mary Russell realises where their search will take them, however, her blood runs cold. A ghostly coach and giant dog have been glimpsed on Dartmoor - the chilling landscape of the Hound of the Baskervilles. As Holmes and Russell work through a challenging tangle of evidence, gossip, and legend to uncover the truth, the grey mystery of the moor swirls around them. Narrator Jenny Sterlin voices the irascible Holmes and the scholarly Russell with such authenticity that their remarkable affection and intellectual energy fill the air.