Actress Joanna Scanlan is another new face to Slow Horses. She’s playing “Queen of the database” Moira, who ends in up Slough House but is confused about the reasons behind her banishment.

Joanna Scanlan, Ruth Bradley, Tom Brooke and James Callis to join the cast. Season 4 will have a two-episode premiere Sept. 4. Slow Horses was renewed for Season 5 in January.