Here is the premise of my Blood Shadow vampire series:
Father, mother and son are living in turn-of-the-20th century San Francisco. The back plague hits, killing both the wife and her son. Father is so distraught that he puts a gun to his head before a vampire knocks on his door and says, “I can make it so that you can see your family again.” And then the story shifts ahead 100 years to modern day when all of this will come to fruition for Thomas Hartwell.
Check out the entire series free at https://www.smashwords.com/books/byseries/4220