Determined to fulfill a promise to his daughters, Walt Disney tries for twenty years to obtain the rights to author P.L. Travers' beloved book. Armed with his iconic creative vision, Walt pulls out all the stops, but the uncompromising Travers won’t budge. Only
when he reaches into his own complicated childhood does Walt discover the truth about the ghosts that haunt Travers, and together, they set Mary Poppins free!