The House of Dark Skulls A historical horror novel of terror

In London, England, 1713, Lord Seamus Olsen, arrives at The House of Dark Skulls, a place so evil that no one dares to go unless they're mad. And, while he awaits the London Ball of Vampires and Demons, he meets Lady Edwina Carnavan, (a distant cousin to Lord Simon and Lady Gemma Carnavan, pictured on the book cover)...