This is quite a decent little conspiracy mystery. "Cynthia" (Jean Lodge) is the eponymous heiress who has been living in the care of her controlling, wheelchair-bound, step-father "Kimber" (Philip Leaver - reminded me a little of Francis L. Sullivan). When she announces that she wishes to marry; he has to act and she promptly disappears. Her friend "Miss. Frayne" (Julia Lang) goes to investigate and puzzled by all of this, summons her employer - the hypnotist "Dr. Morelle" (Valentine Dyall) to get to the bottom of everything... It's a fairly routine mystery, and as it is told via retrospective ...