Angelica was the spirit who inhabited Mrs Bartholomew. (AUDIO: Chapel of Night)
After her previous encounter with George Litefoot, she retreated to her ship. She was the only survivor of the a crash of an experimental spaceship. She started to kill people in order to make herself corporeal in this reality. She planned to take the essence of Litefoot, Henry Gordon Jago, Aubrey, Luke Betterman and Percival Quick to make her fully corporeal. She first started with Jago and Litefoot but because they were part of a different reality it didn't work and allowed them to destroy the ship. (AUDIO: Too Much Reality)