The series is a darkly humorous espionage drama that follows a dysfunctional team of British intelligence agents who serve in a dumping ground department of MI5 known un-affectionately as Slough House.
In Season 3, adapted from Real Tigers, the third novel in the Mick Herron series, a romantic liaison in Istanbul threatens to expose a buried MI5 secret in London. When Jackson Lamb (Oldman) and his team of misfits are dragged into the fight, they find themselves caught in a conspiracy that threatens the future not just of Slough House but of MI5 itself.
The series also stars Kristin Scott Thomas, Jack Lowden, Saskia Reeves, Rosalind Eleazar, Christopher Chung, Freddie Fox, Chris Reilly, Samuel West, Sophie Okonedo, Aimee-Ffion Edwards, Kadiff Kirwan and Jonathan Pryce.
Ṣọpẹ Dìrísù joins the season three cast as Sean Donovan, the former head of security at the British embassy in Istanbul, along with Katherine Waterston who plays Alison Dunn, an MI5 agent who uncovers a dark secret at the heart of the agency.
First-look images can be found below.