After more bloodshed, the children plan to leave. Susannah volunteers to go with them and strives to get Cassie to safety. It is evident now that they must be stopped. And there's no easy way out.

Two years later. The children go behind Susannah's back to express their desire to leave Midwich and Susannah suspects ulterior motives at work. Meanwhile, tragedy strikes one of the families. Paul and Susannah work together to uncover the truth.

With Susannah ostracised, the children's hold on Midwich strengthens. When Paul awakens to the children's true nature, he pleads with Susannah to try to forge a truce with them. Meanwhile Zoe and Sam are galvanised into action by another miracle.

Whilst investigating Amrita's disappearance, Paul's own attachment to Nathan is challenged. Susannah tries to understand the cause of the children's violent instincts. The children now see Susannah as a threat and use their powers to neutralise her.

Three years after the blackout. The children are entering the second phase of their development. Susannah notices changes in their behaviour and makes a terrifying discovery. Her worst fears are realised when a forgotten mother emerges.

As the town recovers from the devastating effects of the blackout, a truly horrifying discovery is made and an emergency town meeting is called to address the issue. Susannah manages to foster calm in the community, but secretly she is fearful of what this phenomenon might mean, particularly for Cassie.

A quiet town is hit by a supernatural event that leaves everyone in a certain part of it unconscious, and all the women of childbearing age are found to be suddenly and inexplicably pregnant. As news spreads and tensions simmer, it is up to psychotherapist Dr Susannah Zellaby to help support those affected, while local detective DCI Paul Haynes is given the tasked of maintaining order.