Is it possible that someone other than Jeremy or Sheila could be responsible for the murders that took place at White House Farm? Or is it certain that it can only be either one or the other? I think that there is another person who had motive for the killings, and could have possibly carried them out. I am not going to say that individual's name, obviously, and i am only speculating here. But to me, the person in question is highly suspicious, for a number of reasons.