Marcella

More than a decade after quitting the force to start a family, former detective sergeant Marcella Backland is devastated by the breakdown of her marriage. When a detective comes seeking her opinion on an unsolved case she had investigated, Marcella returns to police work to try to catch the killer.

The Gibson family contacts the police about Grace’s disappearance, while Marcella tries to make sense of her vague memories of visiting Grace the night before. Sex-worker Cara’s habit of robbing her clients lands her in danger.

Marcella waits anxiously for Grace’s body to be found and tries to fit together the pieces of the night by searching CCTV footage. Sylvie, distraught over her daughter’s death, is livid to learn of Grace and Jason’s relationship.

The detectives get a new lead in the Grove Park Killer case when an elderly man narrowly escapes becoming the next victim. Meanwhile, Marcella notices a taxi cab on the CCTV footage from outside of Grace’s house, and she interrogates the driver.

Marcella interviews Peter Cullen in hopes of closing the case on the 2005 murders. Jason gets his job back at DTG Construction, but he struggles to move past Grace’s death.

Marcella and the team search for the killer’s most recent target—a six-year-old girl—desperate to find her alive. DNA evidence leads to an arrest, and DI Williamson investigates Andrew Barnes’s death.