It's good. But I don't like the story of the brother. I would want to focus for the main couple and the second couple more.
How about a plot twist, that the brother is just in coma? Lol
@mabou yeah, even the author is preventing them from knowing who is the stalker. Like what happened when her sister described her boyfriend's car being red, then at the same time the faucet was opened so she wasn't able to hear it.