This was the basement in Jasmine’s manuscript.
Simon is Sebastian and helped Jasmine get revenge on her unfaithful boyfriend (Liam) and now ex-friend (Sophie)? Brother and sister psychopaths or two sisters (maybe Sebastian used to be Jasmine's housemate Helen)? Miranda and Cassie were just unlucky to join the company, two friendless, guileless, earnest Aspies Simon saw as toys to break?