Mia and Ed get closer but their relationship is thrown into jeopardy when their secret is discovered. Toby gets closer to Renie but offends her when he breaks through her synthie mask. Things look bleak for Niska until Laura brings in a surprise witness. When Milo confronts Athena about her secret agenda, she persuades him her research could be mutually beneficial. Karen and Pete delve deeper into the mysterious 'seraphim' investigation. As Hester's influence over Leo becomes clear, cracks appear between him and Max.
Elenco: Gemma Chan , Colin Morgan , Katherine Parkinson , Tom Goodman-Hill , Lucy Carless , Emily Berrington , Theo Stevenson , Ivanno Jeremiah , Pixie Davies , Will Tudor , Sope Dirisu , William Hurt , Carrie-Anne Moss , Ruth Bradley .