When Mia (Gemma Chan) risks falling into the hands of a mysterious organisation, she is forced to take drastic action. Odi (Will Tudor) struggles to find meaning, while Sophie (Pixie Davies) is awestruck by Renie’s (Letitia Wright) ‘Synthie’ lifestyle. As Pete (Neil Maskell) recovers from his assault, Karen (Ruth Bradley) makes an admission that rocks their relationship. Hester (Sonya Cassidy) and Leo (Colin Morgan) stake out the Silo and track down the sniper who killed Ten. Hester agrees to deal with her peacefully, but can she be trusted? Mattie (Lucy Carless) leaves home to reconnect with Leo.