Members of the Midtown Book Club are found murdered.
It is just the beginning of a series of deaths that lead Walt and Ox into the twisted world of a serial killer.
In the late 1960's, the Zodiac Killer claimed to have killed 37 people and was never caught --- the perfect crime.
Oscar Roach, dreamed of being the next serial killer to commit the perfect crime.
He left a calling card with each of his victims --- a mystery novel, resting in their blood-soaked hands.
The media dubbed him 'The Librarian'.
Walt and the Kansas City Police are baffled by the cunning of this vicious killer and fear that he has indeed committed the perfect crime.
Or did he?
Walt and his wacky senior cohorts prove, once again, that life goes on in spite of the carnage around them.
The perfect blend of murder, mayhem and merriment.