The protagonist, Trilby, and a few other people are magically trapped in a haunted house,
and not being able to escape they decide to spend the night sleeping inside.
Trilby then has a dream where he sees a masked killer standing over the corpses of
all the people trapped in the house, and then the killer removes his mask, revealing himself to be Trilby.
When Trilby tells about his dream to one of the others, she tells him that she too had a dream about a masked killer.
Then Trilby says: Let me guess, the killer took off his mask and then it was your face?
but she only answers: No, it was your face.