When Dr. Watson learns of a tragedy involving an old friend, he insists Sherlock Holmes investigate. Whispered voices and ghostly visions have haunted Dorthea Pearl since the death of her husband and Holmes soon finds there is more to them than the suspected hallucinations of a grief stricken woman. The horror of Gray Manor spans the ages of time, encompassing ghosts, ancient rituals of long forgotten religions and much more. Who or what lies at the source of the haunting? Can Sherlock Holmes solve its deep seated riddle?