Who enters the attic through the skylight and why?

Melchisedec is the only witness to an interesting incident in the attic while Sara is out. He sees two men breaking into the room via the skylight—Ram Dass and Mr. Carrisford's secretary, though Melchisedec does not know this. Ram Dass reveals that he watches Sara through their windows, and that she is a friend to all, even rats. He also references a plan being made by Mr. Carrisford, evidently to surprise Sara, hence the two men's decision to enter the room in her absence.

y