There is no such thing as a vampire... or is there?Sherlock Holmes and Dr Watson are summoned to Dartmoor by an old schoolfriend of Watson's, Bill Holcombe. His sixteen year old daughter Amelia, who died a month previously, has been seen wandering the village at night. Witnesses swear that she catches animals and sucks their blood. The whole neighbourhood fears the 'Snow-White Lady', and Holcombe is desperate to prove she is not a vampire.The great detective's famous scepticism is put to the test in a mystery where boundaries blur between the living and the dead...