Agatha Christie's Smart Home

Agatha Christie's estate installed a smart home system. Now, every time someone enters the drawing room, Alexa announces: 'One of you in this room is a murderer.' The butler has quit three times, dinner parties are awkward, and the system refuses to reveal who until everyone has gathered for the final course. The technician tried to fix it but was found unconscious in the library with a candlestick nearby.