Dark Legacy — Gail Z. Martin

After surviving the Wild Hunt, Sorren and Dietger begin putting the pieces together for their new vocation when a mysterious Viking chalice shows up on their doorstep. They must follow a series of cryptic clues to discover its dangerous secrets, leading them a powerful supernatural enemy who will stop at nothing to destroy them.

This series of adventures spans over 500 years, from the 1500s to modern day as a small cabal of vampires and their human helpers battle supernatural enemies to find and destroy dangerous magical items and keep the world safe from dark forces.