For better or worse, Tenet is the most important film of 2020. Sure, it’s the new Christopher Nolan film, an event movie shrouded in secrecy with a terrific cast which in any year would be an important mark on the cinematic calendar. But this year, when cinemas have been closed for months, where streaming services are king and several big releases have eschewed a theatrical opening altogether or been pushed back to 2021 and beyond, all eyes are on Tenet.