For the dialogue in my story, the villains think that they are being spied on, with their computers hacked. They know someone is doing it, but they do not know who. So when the villains talk about this mystery stalker, and what to do about that person, should they refer to the stalker as him, her, or them? The person after them, is a he, but not sure what they should refer to him as, since they do not know. What do you think?