The Executioner is a new type of criminal. He advertises his crimes as forthcoming events. In a letter to The Times, he announces his intention of personally restoring the death penalty in England and, by the end of the week, his first victim is swinging at the end of a rope. Meanwhile, Det. Chief lnsp. Glass races from Carlisle, Blackpool and Liverpool on the trail of a vicious gang who are robbing Post Offices. Will he get to them before The Executioner? The trail ends in London on a crowded Bank Holiday afternoon.