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May 6th begins like any other day in Midwich. But as dusk falls, the lives of its residents are profoundly altered forever. As family members fight to save their loved ones from an unknown fate, a community is forged in a way nobody thought possible.

Midwich is recovering from the blackout when a shocking discovery is made: every woman of child-bearing age inside the zone on May 6th has fallen pregnant. But of graver concern to Dr Susannah Zellaby is the unnerving responses of the pregnant women.

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.

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.

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.

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.

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.