This book goes back to the basics of vampire lore. I don't know if this is a series or not but but I kind of hope so. I did have some issues with it. The characters are very likable and I found myself worried about them and hoping they didn't bite it.
If you want more information on it check out on goodreads: https://www.goodreads.com/book/show/674004.Fiends_of_the_Eastern_Front?from_search=true&search_version=service_impr