What are three ways in which Helen's situation when she comes to Holmes is similar to Julias just before death?
There are a number of similarities between the two sisters in this story. When Helen Stoner arrives, it is clear that she fears her fate will exactly mirror that of her sister: the two are young women, but both are prematurely aged by their living situation ("her hair had begun to whiten," Helen says of her sister, "just as mine has"). Because the sisters are twins, they are established as a sort of natural parallel, reflections of each other.
At the time of her death, moreover, Julia was deeply terrified—Helen describes her "terrified scream." At the time of her visit to Holmes, Helen too is gripped with fear, declaring, "it is not cold that makes me shiver . . . it is terror." She is sure that the "impending doom" will also claim her as a victim.
Finally, we know that Julia had become engaged shortly before her death. Helen, too, has recently accepted a proposal from a man, and due to repairs at the home, she has been forced to move into the room where Julia died, sleeping in the bed in which Julia slept.
Helen is in a similar position as Julia was in several ways.
They are sisters.
They are or were living with Dr. Roylett.
They fear what was about to happen (or, in the case of the dead sister, what did happen).
They heard a mysterious whistling in the night.
They sleep in a room with a false bell rope.
They were both about to be married when strange things began to occur.
They both hear a low whistle in the dead of night.
They were both afraid of their step-father and his wild animals that roamed freely on the grounds.