** spoiler alert ** 
 the beginning was a bit slow, but as soon as she arrived at the home of vida winter i was trapped in the book, although there are still some things i dont entirely understand if someone could help me please? 
 first of all i am very confused about the three children, i know the girl with no name is vida but what was happening with the real adeline? was she disappearing and vida would take her place? please explain... 
 if i am to understand correctly its possible that the emmeline that died in the room with vida could have been actually adeline? 
 finally im still not entirely sure what was wrong with margarets mum? was she depressed? 
 thank you for any help and explanation! :) fantastic book, it irritated me how she would stop with the story when i wanted to know more!