Ghost Theory Three
Ghosts that return to seek vengeance on their slayers, to punish the
living from crimes against them or their descendants (Shakespeare’s Hamlet
father).
Ghosts that seek proper burial. Ghosts are supposed to be souls that
remain when their bodies have been improperly buried, or not buried at all
as with Odysseus’s friend Elpenor. Harry Price the famous ghost buster of
the 30's pretended that the main ghost of Borley Rectory departed when he
gave Christian burial to some old bones he found under the Rectory.
Ghosts that come to complete some task left undone or to continue one. The
ghost of an American farmer returned for the specific purpose of informing
his heirs where he had hidden his will.