Since you and Marie were good friends, she invited you to live in the cathedral with her to keep her from harms way. When you got there, you met two other people.

Double and Valentine.

Valentine appeared to be a nurse, while Double was more so a nun. She introduced herself as "Sister Agatha".

Anyway, this "sister agatha" didn't seem all too human... why are her eyes constantly closed??... it's not like you're going to get any answers anyway...