Jack Doyle returns to the race track, volunteering to aid FBI agents in a search for criminals fixing races. Doyle then becomes involved in protecting Rene Rison, the favored daughter of the Significant Seven's leader Arnie Rison. Jack Doyle, as always irreverent, observant, opinionated, sometimes mistaken but always persistent, eventually manages to find answers to the questions of who is fixing the races and who is having members of the Significant Seven killed off.