“If this truth were just known overnight, that would mess up a lot of people,” says Spielberg about the impact of disclosing alien life.

Disclosure Day, the new whistleblower thriller from Steven Spielberg, arrives in theatres today.

As the race goes on, the movie veers between comedy and suspense, action and contemplation, the sounds of squealing tires mixing with sober interludes that touch on belief, reason, trauma, self-govern...