Based on the autobiography of a brilliant young master of deception and the FBI agent hot on his trail. Frank W. Abagnale, Jr., passed himself off as a pilot, a lawyer, and a doctor all before his 21st birthday.

Set in rural England and Europe during the First World War, the story begins with the friendship between a horse named Joey and a young man called Albert, who tames and trains him. When they are forcefully parted, the film follows the journey of the horse as he moves through the war, changing and inspiring the lives of all those he meets; British cavalry, German soldiers, and a French farmer and his granddaughter.