Hailey and Zach are out of school on a year long adventure. First stop: India! The excitement begins the moment they step off the plane. Hailey and Zach are entrusted with the magical diary of Shah Jahan, legendary builder of the Taj Mahal, and are whisked off on their first real adventure. The Taj pool shimmers in the full moon, and suddenly the twins are not just traveling the world but traveling back in time, sent on a mission to free the shah and his princess daughter from their prison tower. With the help of their ingenious friend, Sushil, anything seems possible. Can they help the shah win back his rightful place on the throne? Will they change India's history forever? Time is running out! Will they succeed before their parents' work in India is done, and it's time for them to move on?