In the 1920s, decades after the troubled and unhappy marriage between Soames Forsyte and the beautiful pianist Irene Heron came to an end, Soames and Irene have both remarried and moved on. Irene is happily married with a son to Jolyon Forsyte - causing Jolyon to be even further considered as an outcast and traitor by the Forsytes - and Soames to the beautiful, yet very unfaith...