It is April 1968 and change is coming to Nonnatus House. The sisters intend to make a good impression on new recruit Sister Veronica. It's clear she is no shrinking violet and will ruffle a few feathers. Racial tensions cast a shadow over Poplar following Enoch Powell's incendiary ‘Rivers of Blood' speech. Nancy and Trixie team up to support terminally ill patient, and Fred is saddened to receive an official letter confirming the disbandment of the Civil Defence Corps.