I read a book once when I was in jail that I cannot for the life of me remember the name of. It was about this man who looks for magic artifacts. His wife is a sorceress, and they have a family friend who’s a sorcerer as well. All I remember is that it was about looking for a magic box with jewels on it that (I think) once belonged to Rasputin or something. And the antagonist of the story were these vampire/bat creatures and a super strong/invincible Nazi guy. I know this is probably a terrible description but if anyone knows its name I’d really appreciate it. On the cover of the book was a picture of the bejeweled box. It was sci-fi/fantasy. I believe from the 80’s?