Mother Mildred and the Nonnatus House team go to the Outer Hebrides in response to a nursing shortage. Navigating the terrain, they strive to keep up with the needs of the locals.

As Christmas approaches, a bout of influenza sweeps through both Nonnatus House and the Turner family. When Mother Mildred declares that God is calling her to set up a branch house in the Outer Hebrides, it seems an ideal opportunity for the nuns and midwives to convalesce in the bracing, Scottish fresh air.