In 2016 the celebrated artist Christo launched The Floating Piers on Italy's Lago d'Iseo, an enormous dahlia-yellow path above the water that was eventually experienced by 1.2 million people. Yet the work was first conceptualized nearly fifty years before, a shared dream of Christo and his wife and creative partner Jeanne-Claude. Ten years after her passing, Walking on Water delves into Christo's journey to bring the project to life.