I wasn't happy with Viereck always writing the full name when mentioning the protagonist, after the 10'th time it made me want to stop reading the book. But I never do that, so read on I did.
I love that this had no Happy end. I like that an old book like this, first published in 1907, used the theme of an 'emotional' & artistic energy sucking Vampire!
You can read this at Gutenberg Project, it's a quick one.