Hardcastle is quite upset when he is criticized in Without Sin, the autobiography of retired mobster Joseph Cadillac. Figuring that the mob, also the subject of Cadillac's criticism, will be angered as well, Hardcastle has Mark follow the author. Mark's surveillance turns into a full blown car chase after Cadillac realizes that he is being tailed. Based on his driver's reckless driving, Cadillac is pulled over by the police and his car is impounded. Later, Hardcastle is surprised when Cadillac comes to him for help. Upon learning that the mob has kidnapped Cadillac's innocent son (a priest) in order to get the evidence the mobster used to write the book, Hardcastle agrees to help. One complication: The evidence is in the car that the police impounded (pending a judge's ruling regarding the legality of a search). Deciding that a life is more important than the letter of the law, Hardcastle breaks into the impound yard and retrieves the evidence. With evidence in hand, Hardcastle and Cad (thetvdb.com)