A Third Doctor, Jo and Unit novel. In Dartmoor, a punk band get into a fight with a group of rich and rowdy young students, whose Range Rover crashes into their car. The groups are spurred on to insane acts of violence by a mysterious force, and the punk band singer hears a voice in his head which directs him towards a rusty knife buried in the ground. Murder ensues and blood soaks into the rock. It is much later on that a creature emerges from the bloody rock, greedily anticipating the chaos that it plans to cause...The Tardis alerls the Doctor to an incongruous energy fluctuation in the southwest of England. There, he finds himself part of the audience of one of the band's gigs, and their anarchic music is attracting an ever-growing convoy of violent disciples. What is the dormant force that has been awakened, and what are its destructive aims? How many more people must suffer a brutal death before the Doctor can halt the bloody trail of the convoy?