With the revelation that her father is alive, Jessica and Milner set off to find him. Arby takes Grant and Anton to a place from his past, a remote mountainside where he came as a child.

Cast: Adeel Akhtar, Paul Higgins, Geraldine James, Neil Maskell, Fiona O'Shaughnessy, Alistair Petrie, Alexandra Roach, Nathan Stewart-Jarrett, Oliver Woollford, Ruth Gemmell, Emilia Jones, Sylvestra Le Touzel, Ian McDiarmid, Paul Ready, Mark Bagnall