When her older brother Jack and her father John set sail for the Japans onboard the Alexandria, Jess is left in England in the care of an elderly woman, Mrs. Winters. Jess is the only reason Jack wishes to return home to England due to the fact he is afraid she may end up working in a workhouse in the event of Mrs. Winters' death. Jack attempts writing to Jess, informing her of her father's death and various other important events that occur throughout his journey, although it is unknown if she receives the letters.
Jess looks a lot like Jack having mousy blonde hair and the same blue eyes. She is three to four years younger than Jack, and it was insinuated that the two siblings were very close.