The new series of the critically acclaimed drama continues. Laura (Katherine Parkinson) must decide whether to accept Niska's (Emily Berrington) request, while Karen (Ruth Bradley) and Pete (Neil Maskell) learn about a special Synth being sold for unprecedented amounts on the black market. Hester (Sonya Cassidy) uses questionable means to gain information from her prisoner, and Leo (Colin Morgan) faces a new mission. Mia (Gemma Chan) takes a risk to help Ed (Sam Palladio) but is her secret now in jeopardy?