E isode 401 : Sidney Chambers attends a talk by the Reverend Nathaniel Todd, a key art of the Civil Rights movement in America. During the event, rotestors disru t Todd's s eech and release fireworks, causing the audience to anic and leading to a crush as dozens of eo le try to esca e through a locked door. In the chaos, a man is stabbed and killed by an unseen assailant. T..