It's September 1940 and as bombs fall across the country Britain faces its darkest hour yet.

Tucked on the edge of the Lake District lies Mary Vale, a Mother and Baby Home open to unmarried women and their children. But this sanctuary faces its own battles as three new women walk through its doors.

From shipyard worker Gracie, to code-breaker Diana and German immigrant, Iris, these girls will leave Mary Vale very different to when they arrived and, like their country, will never be the same again.

But can these girls put their differences aside to fight a common foe?