Slough bank manager Jamie's birthday is rocked when he is arrested on suspicion of being an international cyber terrorist. Interrogated by police, he is confronted by a recent photograph of his wife Layla, who he hasn't seen or heard from since she mysteriously vanished seven years ago.

With the population in turmoil and the roads in chaos, Jamie and Dave's mission to find Layla becomes beset with bizarre obstacles.

In Poland, Father Jude and Sister Celine try to help a young girl escape from an angry mob that believes she is the Messiah. As well as making a strange prophecy, the child turns out to have surprising parentage.

Taking a step to the dark side, Rhonda horrifies herself when she realises she will do anything to maintain her freedom.

Jamie makes a discovery that leaves him feeling completely betrayed. As his mother tries to comfort him, he realises just how disturbed she really is.

Deeply unhappy about the choices he has made in the name of professional duty, Scotty tries to make amends. However, his actions fail to go down well with Gaines.

Scotty is forced to choose between sister Rhonda and Operation Saviour when he spots a crucial error in the plan to save the world. With just two weeks to go until impact, Messiah hunters Celine and Jude investigate a marriage cult on a holiday island. Plus, Ariel embarks on a threatening mission. And, eager for answers, Jamie travels with Dave to what he believes is Layla’s home, where the danger proves far from over for him and those close to him.

Jamie seriously underestimates Ariel’s intelligence when the pair come face to face in uncertain circumstances. Meanwhile, with their apocalypse plan in motion, Scotty, Gaines and the team anxiously wait to see if they have done enough to save the world. Plus, Celine is forced to make a major decision about her future, and there are huge consequences when Father Jude makes a daring stand against the Vatican hierarchy.

Jamie panics when he finds himself separated from Layla and Frankie just 24 hours before the end of the world, but his luck could be about to change when he strikes a deal with his grandmother. Meanwhile, a recent tragedy causes Sr Celine to return to Slough, the President gets a nasty shock when he arrives at the bunker and Rhonda and Leanne force down their last meal before facing the firing squad.

The race is on for Jamie as he struggles to assemble his loved ones, rescue Layla from the clutches of his evil twin and reach the bunker before the approaching meteor strikes. Meanwhile, Sr Celine makes a discovery that makes her want to survive the apocalypse more than ever, while those racing from America to Sutton's bunker are put in jeopardy when their plane is forced to land in a field.