In the aftermath of the incident on the pylon--one of the great electrified structures that dot the English countryside like so many gargantuan grasshoppers--Clodagh goes off to university, moves into a basement flat arranged by her unsympathetic family, and finds freedom trekking across London's rooftops with a gang of neighborhood misfits. As she begins a thrilling relationship with a fellow climber, however, both Clodagh and the reader are haunted by the memory of the pylon and of the terrible thing that happened there--and by the eerie sense that another tragedy is just a footfall away.