Warning: This show contains “Churchill's Secret” spoilers.

Actors Sir Michael Gambon and Romola Garai -- who play Winston Churchill and Millie Appleyard in the film "Churchill's Secret" -- have a relationship as lighthearted on-screen as they do off.

Here, the two come together in this exclusive interview to talk about the film, Albus Dumbledore, and the necessity of secret keeping. Also hear from the film's director, Charles Sturridge, on bringing this remarkable and true story to life.