While he first gained fame for his role as Collins in Dunkirk, the WWII epic from Christopher Nolan, Jack Lowden has exploded in popularity over the last few years thanks to his work in Slow Horses.

The U.K.’s National Theatre Live has released a new trailer for “The Fifth Step,” featuring Olivier Award-winner Jack Lowden (“Slow Horses,” “Dunkirk”) and Emmy and BAFTA-winner Martin Freeman (“The ...