Following on from the dramatic conclusion of the previous series, season 3 sees Marcella in Belfast as an undercover detective. She has taken on a new identity, Keira, and has infiltrated the infamous Maguire crime family but as she investigates their activities, questions come to the fore about how much she’s embraced the Keira personality and left Marcella behind.

• Anna Friel
• Nicholas Pinnock
• Ray Panthaki
• Sinéad Cusack
• Amanda Burton
• Nina Sosanya
• Jamie Bamber
• Harry Lloyd