Nonnatus House is abuzz with excitement as the countdown to Trixie and Matthew’s wedding begins. Whilst Sister Veronica has appointed herself in charge of organising the wedding gifts, Trixie’s brother, Geoffrey Franklin, arrives from Malta and immediately starts arranging the perfect hen do. However, the approaching nuptials cause stress levels to escalate as a catalogue of small and great disasters threaten to spoil the day. Dr Turner, Shelagh and Timothy are first on the scene of a fatal car crash. Dr Turner experiences the biggest test of his career as they race against time to save a precious life. Meanwhile, Nancy considers her future, and Sister Julienne hatches a plan to save Nonnatus House once and for all.