Attempting to capture a figure's entire life in one film is a task doomed to fail. It's an issue we saw just a few months ago with the earnest but conventionally shallow Respect. The best historical biopics understand this and instead choose to limit the focus to one key period of time. It's just one of the elements that make Pablo Larraín's harrowing portrait of a tragic princess such a spectacular success. Another is an actor at the absolute top of their game in one of the finest...