Boy meets girl; boy falls in love with girl; boy loses girl... when they discover they are brother and sister! Such is the fate for Gilly Noble and Jo Wingfield, who, after falling in love at a Indiana hairdressing salon, find out from a private investigator that they are siblings. Jo's acquisitive mother Valdine is overjoyed at the news and promptly convinces Jo to marry Jack, a multimillionaire who relocates his new fiancee to Oregon. When Gilly finally realizes that he is the victim of a case of mistaken identity, he heads to Oregon to win back his love -- only to be impeded by Valdine every step of the way.