The black charade

"Dr. Caspian and his wife Bronwen, both possessed of genuine psychic powers, have gained a reputation as investigators of so-called psychic phenomena, exposing a number of fraudulent mediums. They are consulted by prominent politician Joseph Hinde, whose daughter Laura has become strangely withdrawn. He suspects she may be attending sẻances in an attempt to contact her dead mother. Asked to rescue her from the clutches of evil charlatans, the Caspians' investigations uncover a trail of people dying in strange and horrible circumstances..." --Publisher description.