While staying with relatives in Rajasthan India Reeya Rai and her friends are playing a game of cricket when they stumble upon an ancient water-filled stepwell. Reeya and her friends decide to create a submersible with a camera to explore the stepwell and uncover its secrets. In the watery depths they discover an ancient door with a mysterious symbol on it. Could this be the key to discovering one of India's ancient lost treasures? And will they uncover the truth before Dr. Acker and his daughter Elsie learn about what they've found?