S1·E13 A Beginning

Abby is tiring of life at the grange and her thoughts turn to resuming her search for her son. After a row with Greg over the taking in of a sick girl, Ruth. Abby sets off for Waterhouse to find Jimmy Garland. Meanwhile Greg and Arthur make their first attempts towards federating the communities that have sprung up since 'the death'. When Ruth recovers, Greg and Jenny discover she is a former medical student and that she has some startling news for them...