Steer a Pale Course — Gail Z. Martin

Two young fishermen in post-Revolutionary America are forced to retrieve a deadly object from an ancient burial mound or face the vengeance of raiders who have taken their village hostage.

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.