Joey, a mentally unbalanced man tries to be accused of a series of crimes committed in women and young people who looked alike physically. For a rare coincidence the real serial killer begins friendship with Joey and gives him the particular details of his crimes so that Joe's story rings true to the police. As always, Bumper manages to untangle the skein. A young man confesses to brutal murders that he did not commit.
The Blue Knight receives the signal loud and clear when a Death Echo sounds.
Bumper tells down-and-out bum Joey to stop disturbing the police when he keeps confessing that he's the one responsible for raping and murdering four women. But when Joey begins to give details which only the cops and the murderer know. Bumper realises that Joey has become the sounding-board for a maniac.