The Slender Thread (1965)

Synopsis
Sidney Pollack marked his feature film directing debut with this taut suspense drama, based upon an actual incident reported in Time Magazine. Sidney Poitier stars as Alan Nuell, a student volunteer at a medical clinic in Seattle who answers the phone to find Inge Dyson (Anne Bancroft) on the other end. Inge, depressed about her life, has just taken an overdose of sleeping pills. With Inge slowly dying, Alan tries to keep her talking on the phone while the police try to trace the call and save her life. Inge tells Alan that she has decided to end it all because her husband has discovered that he is not the father of her son. ~ Paul Brenner, All Movie Guide