Liz finds herself on the march after becoming friendlier with Dr. Sarah Martin, who has been accused of being a Red sympathizer. Sarah and Liz participate in a peaceful demonstration that turns violent when the police intervene. With political implications for Arthur, Angela volunteers to interview Liz and Sarah and soften concerns that Liz could be involved in Communist activities. However, Sarah's visit to Larkfield Manor creates tension with Klaus, himself a victim of a demonstration. The animosity between Klaus and Sarah threatens his relationship with Vicky. ...