Christopher Nolan (Interstellar) returns to cinemas - at least those which are open right now - with Tenet, his new twisty, ultra-secretive thriller. Starring John David Washington (Monsters and Men), Robert Pattinson (Water for Elephants), Elizabeth Debicki (The Man From U.N.C.L.E.), and Kenneth Branagh (Wild Wild West), this film really puts the audience through its paces. Bring your calculator, slide rule, copy of A Brief History of Time by Stephen Hawking, graph paper, a much smarter friend, and an EXTREME amount of patience.