The Sons of Gulielmus saga, the Desert Guards series, and the Masters of Maria stories are set in the same world, have have significant character overlap, and take place one after the other.
Sons of Gulielmus
Gulielmus is an ancient demon—an incubus—who has been propagating with human women in the New World since the time of the Roanoke colony. He sends his half-breed sons, cambions, out into the world to taint the souls of women, not realizing it’s them who are the ones who could so easily be swayed to the other side.
A year after the events of A Demon Bewitched, a family of were-cougars in New Mexico learns the hellmouth on their ranch didn’t open by accident.
Masters of Maria
Set about a year after the conclusion of Desert Guards. Powerful supernatural beings are clustering in Maria, New Mexico with some…exciting results.