What is the fetch?
A fetch in Irish legend is the apparition of someones shadow
seen not accompanying the shadow's owner (think Peter Pan.) A fetch
seen without the owner means death of the shadow's owner. It is
greatly akin to another European legend, A doppelganger. The main
difference however, a fetch can be seen by anyone, whereas, a
doppelganger can only be seen by their opposite. A fetch is
commonly said to haunt the dying person to death.