The victim in this episode is for the change not a human being but a computer. An infiltrant who is emptying out a poisoned liquid into George/XR40 (so is called the computer) is responsible for that. Tara King who is disguised as a cat at the beginning of this episode, will be infiltrate as Prunella, the niece of Pelley. This Pelley who is the maker of George/XR40 has been replaced by an intruder. Later Tara finds out the butler is a traitor too and first she trusted him. The real habitants are being hold as prisoners in the cellar.