It's 1966, and it's a testing time for the midwives. But there's excitement, too, as the women's rights movement intensifies. With Trixie's help, Sister Julienne is determined to steer Nonnatus House out of its financial quandary.
Dr Turner deals with an array of difficult cases including a former soldier involved in nuclear test explosions. Meanwhile, Sister Monica Joan experiences a crisis of faith, and Sister Frances realises she needs to be a little less spiritual if she's to really connect with the local women.
There are some interesting challenges ahead, as well as great celebrations when England wins the World Cup.