A Kingsmarkham bypass is planned which will take congestion and air pollution out of the town but put tarmac and heavy traffic through a stretch of much-loved countryside. Feelings are running high on both sides. An attractive young German tourist has disappeared, and when her decomposing body is found it is not clear whether the crime is part of a conspiracy or sex-related. Wexford is about to become a grandfather and is struggling to cope with family life and to do his job at the same time. Meanwhile, Dora Wexford has joined the anti-bypass campaign. The murder case continues, and the anti-bypass campaign escalates. People begin to be kidnapped, and this is linked to a militant group of environmental extremists. Under pressure on all fronts, Wexford keeps his cool (even when his wife is kidnapped on the day his daughter gives birth) and pursues the law-breakers to the bitter end.

A girl's badly decomposed body is found, and cabdriver Stanley Trotter is suspected of murder.