The von Artle Legacy Chadam House Edition

There is no category listed for this. It is not a religious treatise, nor is it anything to do with Satanism. Based on a true happening. A woman inherits a house on an island in Florida. She and her husband move there and begin restoring the old place. They encounter three ghosts. Two are friendly, one is definitely not! Why were there ghosts where no murders or any such things ever occurred?