S4, E1: Since Martin and Louisa both got cold feet on their wedding day, Louisa has left, and Martin has been finding life in Portwenn infuriating. When he unexpectedly meets his old flame Edith, now a top-ranking doctor who is clearly surprised at the way his life has turned out, he starts to consider new directions, but Martin's thoughts are turned upside down when Louisa returns - with big news of her own.