Senator Nick Rast (David Hemmings) has a bright political future aided by the ruthless power hungry Doc Wheelan (Broderick Crawford). But his home life isn't so perfect - his marriage is a sham and his young son has leukaemia. Enter Gregory Wolfe (Robert Powell): a flamboyant, mystical faith healer who helps to cure the boy and captures the heart of Rast's wife Sandra (Carmen Duncan). Wheelan plots against the stranger and throws him into a prison that Wolfe miraculously escapes from. Then, dressed as a Harlequin, he confronts Rast with the evil of Wheelan's power lust, but all the while he is in the sights of one of Wheelan's killer marksmen.