Demons from the Dark Dimension pour through a portal in the wall of Pittingham Manor, the mid-point for an attack on high. They're planning an assault. Into this chaos stumbles 12-year-old ghost-busting psychic Alannah Malarra and burglar Worley Flint. Up until now they've only ever faced tame treasure-hording ghosts, but this is something else. Their only hope is a plucky angel police patrol on a routine earth-monitoring mission. Enter Inspectre Flhi Swift and officers Yell and Gloom.