The walls begin to close in on William and Anna before a tragic event changes everything. Anna's mother admits to a shocking secret about the past.

Cast: Richard Armitage, Charlie Murphy, Indira Varma, Rish Shah, Anil Goutam, Sonera Angel, Isla Jackson-Ritchie, Pippa Bennett-Warner, Marion Bailey, Nathan Hubble, Jane Dowden, Cath Whitefield