Warning This Section Does Contain Spoilers
This letter is the back story to our case. It is written to us from Grace, also known as Granny, Isabella's Grandmother. She says we have met in the dream space once and because of this she knows we will help her and Isabella.
Isabella is apparently in a state called "body-without-soul", which we read about on their blog.
Bella has been in this state for a month now. She has Dr. Harold G. Oliver attending her but her grandmother takes care of her daily needs. By reading this letter we immediately think the setting is possibly at an older time because she refers to changing her "chamber pot". But we know from additional evidence that the setting us current time and that the Grandmother is just leery of outside technology. She signs this letter with her name in the symbolic alphabet that we need to decode her instructions.