At Brands Hatch motor racing circuit the Saint meets Cynthia Quillen and Teresa Montesino, two racing drivers who are deadly rivals. Whilst the Saint is testing Cynthia's car he discovers that it has been sabotaged. He also intercepts an assassin out to murder Cynthia with a high-powered rifle but the killer is himself shot before he can tell the Saint who wants Cynthia out of the way. Teresa denies any involvement with either incident and the next day the two fast women prepare for the big race.