After a small-town race sponsor receives a death threat, Michael enters K.I.T.T. in the rally to investigate the case. Jamie Downs barely escapes serious injuries when her four-wheel drive vehicle is forced off the road and rolls down a steep embankment. Jamie is sponsoring the local racing event, and she is convinced that the attempt on her life has something to do with it. Michael arrives in Marberry - a quiet, peaceful retirement community suddenly taken over by fast cars and rock 'n' roll music. Jamie receives another threatening call at her house while Michael is having dinner with her. Shortly thereafter, Jamie's truck explodes in a blinding flash. Apparently, someone is willing to kill her to stop the race, but why and who?