One of Outlander's biggest mysteries is the presence of Jamie's ghost seen by Frank in the very first episode, a mystery author Diana Gabaldon has said won't be explained until the last book in the series. Could Jamie, gravely injured at the Battle of Culloden, have projected his spirit forward in time as he hovered between life and death? And did his ghost visit Claire in 1946 to create a connection that would draw her to him two hundred years in the past? To learn more about this intriguing fan theory, let's watch this video...