In Shadows of the Wicked by Michael R. Collins

Some ghosts want your soul. For these ghosts, it is only the beginning.

Two brothers try to forget the tragic encounter they had with the spirits of the dead. But the years, and miles, they've run aren't enough distance between them and their tormentors. As the attacks escalates, no one is safe, including their friends. In their efforts to rid themselves of the spreading evil, they find themselves in places that blur the lines of reality, life, and death.