Bombay, 1896. A handsome Indian Prince loses his heart to a European woman of striking beauty. She is staying at the only hotel fit for Europeans- Watson's, in the elite Kala Ghoda area of the city. The Prince gifts his lady love a necklace of gold set with a beautiful sapphire of so deep a blue that it is known as the Kala Ghoda. But then Fate intervenes. An epidemic of the plague sweeps the city and the lady sets...