What do Geoffrey Chaucer’s Pardoner from The Canterbury Tales, a rare and nearly undetectable poison, and a murderous college professor have in common? They are all part of an intricate plot leading to the death of five people including the professor’s three sons. Once again, Professor Bradley Davison of Queens College becomes involved in a series of homicide investigations that have baffled the NYPD and his best friend, Deputy Chief Mag Goldman. The serial killings, which mimicked the events that took place in Chaucer’s “Pardoner’s Tale,” are beyond anything in the memory of the many serial killings that Mag Goldman’s ‘Flying Squad’ investigated in the past. It is up to Brad Davison to unravel the clues that reveal the murderer’s identity. The cause of death? An esoteric poison used only once before many years earlier in a well-known homicide case that the FBI investigated. With that information and his knowledge of Chaucer, Brad is drawn into using his observational powers to aid the police in uncovering one of the most notorious crimes in the annals of the NYPD. In this, the thirteenth Bradley Davison mystery, Brad’s status as a consultant to the police, presents him with challenges unlike any other case he has helped investigate. But will the evidence he uncovers be enough to put a criminal in prison for life?