As the fractured events of Stevie's murder start to swim into focus for River, the awful truth places more pressure than ever on his worsening state of mind. Can he carry on when so much is left unsaid?

Cast: Stellan Skarsgård, Nicola Walker, Lesley Manville, Adeel Akhtar, Eddie Marsan, Michael Maloney, Turlough Convery, Jim Norton, Sorcha Cusack, Owen Teale, Georgina Rich, Lydia Leonard, Steve Nicolson, Josef Altin, Shannon Tarbet