The Walk (E02)

With the town under martial law, Dee and Geoff try to find son Owen who, denied medication, is hallucinating in an isolation camp. Anna has been co-opted to work there and knows something is not right. Thea discovers that a new security unit at the police station is trawling through the footage of the protest, and she notices that Owen is being singled out. She has to act quickly if she is to be reunited with her young son. Husband Dan is increasingly concerned about getting his family out. (BBC iPlayer)