Dir: Bill Hays | Scr: Brian Clemens | Ph: Phil Hawkes | Prod: John Sichel | Mus: Laurie Johnson | Ed: John Hawkins | PD: Michael Eve | SD: Ted Scott | Cast: Maureen Lipman, Richard O'Callaghan, James Grout, John Le Mesurier, Colin Fisher, Rose Hill, Richard Pendrey, John Nightingale, Jan Francis, Jenny Quayle
When a string of young women begin to turn up strangled, a librarian comes to believe that she knows the identity of the killer, but the police are slow to believe a frustrated old maid such as her (29-years-old!), whilst we, the viewers, quickly earmark two or three other suspects as well, in this thoroughly and entertainingly unpredictable mystery-thriller. Well-crafted, with good performances, particularly from Le Mesurier, this Thriller (1973-1976) episode is perhaps as interesting for its glimpse at contemporary societal attitudes as it is for its well thought out mystery plot.