Tales of Unease (Ep 2 - Calculated Nightmare) (1970)

Episode 2: Calculated Nightmare. As staff prepare to leave for home, two office workers stay behind to finish off their day's work. But it proves to be ill advised as they soon discover themselves locked in their office block. A mysterious voice informs them that they will not escape the place alive, leaving the two men to wonder who is behind this and how they can get out alive! Starring Michael Culver, John Stratton, Ursula Mohan, Larry Clark, Peter Madden and Keith Ashley. The 2nd in the short lived Tales of Unease series and a highly effective one, as two men are trapped by a disgruntled former employee. Who is behind it? Will they get out alive? Watch on and find out...