David Stuart Davies 
The Scroll of the Dead [EPUB ebook] 

Sherlock Holmes attends a seance to unmask an impostor posing as a medium: Sebastian Melmoth, a man hell-bent on obtaining immortality after the discovery of an ancient Egyptian papyrus. It is up to Holmes and Doctor Watson to stop him and avert disaster… The action moves from London to the picturesque Lake District as Sherlock Holmes and Doctor Watson once more battle with the forces of evil.