Tenet movie: Christopher Nolan's time-bending thriller kept a mystery even from CAST

“I haven’t heard anything since,” the British star added.

Caine is accustomed to Nolan’s secretive ways by now, having first teamed up with the director for Batman Begins back in 2005.

At the time, he was persuaded to come on board as Alfred Pennyworth for Nolan’s Batman trilogy after the director explained his extended, three-dimensional vision for the character whose relationship was almost that of a father-figure to Bruce Wayne (played by Christian Bale).

Meanwhile, Tenet is being described as an “event film”, but few details are known about what could be Nolan’s most experimental movie to date.