All around the world, people start to see things. To start with, the visions are unremarkable: things caught out of the corner of the eye. But, as time goes on, the visions become more sustained, more vivid. More terrifying. As the visions become truly apocalyptic, some turn to religion, others to science. But what John Macbeth uncovers is much bigger than either religion or science. So big it could cost him his sanity.