Nightmares: India

I'm kept awake at night thinking about the situation in my own city, Mumbai. An upper middle-class family leads a far more privileged life than their Western counterparts. They wear the same labels, drive the same cars, but also employ cooks and chauffeurs. An average family is made up of four people, and they employing five helpers, whose monthly wage is what they spend on a single meal at a 5 star restaurant. What's stopping the help from murdering them in their sleep and taking control of their house, cars, their wealth?