Louise (Yvonne Arnaud) was once married to Polotski. Believing him dead,she remarried,to Sir Duncan (Ralph Lynn). However,Polotski is still alive,and plans to blackmail Louise. At work,Sir Duncan has threatened his employee Mr Penny with dismissal,planning to replace him with a Mr Bullock. When Mr Penny calls at the house in the evening,he finds Louise alone as Sir Duncan is out with a girlfriend. Louise decides to take advantage of the situation,unaware that a suspicious Mr Bullock is outside.