Determined to delve further into Hourglass, Sam makes a startling revelation relating to her past. However, her investigations trigger the interest of Byzantium’s client. When Aidan instructs Natalie to uncover the leak in MI6, her shocking discovery exposes her to dangers on all sides. Byzantium discovers potentially devastating evidence regarding the dam, which Jack Turner plans to use to secure the bid.

Cast: Melissa George, Adam Rayner, Stephen Dillane, Stephen Campbell Moore, Adewale Akinnuoye-Agbaje, Morven Christie, Lex Shrapnel, Juliet Aubrey, Oscar Kennedy, Indira Varma, Patrick Malahide, Tom Beard, Ajay Chhabra, James Daffern, Dan Euston