How the Earth Changed History

Iain visits an extraordinary crystal cave in Mexico, drops down a hole in the Iranian desert and crawls through seven-thousand-year-old tunnels in Israel. His exploration reveals that throughout history, our ancestors were strangely drawn to fault lines, areas which connect the surface with the deep interior of the planet. These fault lines gave access to important resources, but also brought with them great danger.

While Pabitra tells Ruksana about his journey of becoming Yudhishthir, they figure out who the next victim may be. While another murder baffles Sushmita, Ruksana discovers a book that contains a vital clue.