In the story
Burnham plays the older killer encountered in Harlow. This film does not import the full Thomas Hewitt origin or Heather’s inheritance story; it follows its own continuation from the original premise.
Continuity matters
A later continuation of the original film’s premise, separate from the Hewitt remake pair and the Heather/Jed Sawyer branch. Sally is played here by Olwen Fouéré; Marilyn Burns originated the role.