The three forces of Americans, British and Exiles, under the guidance of the Angel, are forced into an uneasy alliance against the threat of the approaching Demon army. The creatures, led by the female entity, are intent upon breaking through the Maunsworth Entry-Point and out into the everyday world.
Thomas and Grace travel back from the Heavenfield to the Array Chamber, but during the transition Thomas is surrounded by a host of Angelic creatures, who decide to lend their support against the Demons.
Meanwhile, Alex has a visitation from the Demon Girl, who forces him into a confrontation that leads to a terrible chain of events, which sees Thomas and Grace hurled once more back into the Heavenfield...