Is Frank Harkness Manipulating Diana Taverner? | Slow Horses Season 6, Episode 3 Explained

Is Frank Harkness manipulating Diana Taverner in Slow Horses Season 6? Diana Taverner is under enormous pressure after her controversial television interview creates questions about MI5 and the mysterious attacks targeting former Slow Horses. At the same time, Frank Harkness is operating in the background, connected to the theft of the physical Slough House files and the people now hunting former MI5 personnel. That raises an important question: how much control does Frank actually have over Diana? Taverner clearly has secrets of her own, especially surrounding Sid Baker and the mysterious movement order connected to Russia. But Episode 3 does not confirm that Frank is directly controlling her. Instead, the episode shows Diana becoming increasingly vulnerable. She is facing pressure from Oliver Nash, conflict with Emma Flyte, and questions from Jackson Lamb about a possible leak inside MI5. Meanwhile, Frank's own agenda remains unclear. Lamb is trying to understand who Frank is working for, suggesting that Frank may himself be operating as part of a larger network. In this video, we explain Frank Harkness and Diana Taverner's connection, whether Frank could be manipulating her, what Taverner may be hiding about Sid Baker, and how their story could connect to the Russian assassins and the stolen Slough House files.