Nelly's promise to protect Grace takes him to Gideon's old addresses and some familiar haunts. Will the truth finally be revealed?

Cast: Suranne Jones, Stephen Graham, Indeyarna Donaldson-Holness, Remmie Milner, Thomas Coombes, Camilla Beeput, Alice May Feetham, Susan Lynch, Nadine Marshall, Lee Byford, Olive Gray, Lennie James