Episode 7

S1, E7: Mo El Sayed holds Marcella hostage at home. He saw her move Grace's body and wants a confession for killing Hassan. Did she murder him to stop him speaking up? Marcella falls into a fugue as Mo holds a knife to her throat, but when she comes to, she's alone and untied. Why did Mo leave her unharmed? DI Tim Williamson questions Sylvie about DTG's relationship with Andrew Barnes. They're under the spotlight, after Tim learns they had a lot to gain from Barnes' demise. When the line of enquiry reaches Jason, things get heated. At the police station, Marcella suspects Yann is too emotional to be the killer after he has a panic attack in his cell. His behaviour isn't indicative of someone capable of murder. Marcella argues her case with the rest of the team, claiming the DNA evidence held against him is weak; hairs ripped from the head contain far more roots than the ones found in Beth's hand. Could Matthew have planted Yann's hair on the scene?