Captives (1996)

Rachel Clifford, currently going through a divorce, takes a job as a dentist in a prison. Philip Chaney, reaching the end of a ten year sentence, the last six years of which he has not had a single visitor, longs for human contact. Rachel's world is turned upside down when, against her better judgment, she surrenders to his invitation. Trying to hide their feelings from the prying eyes of the prison officers and other inmates, the two fall into a world of fear and desperation when an inmate henchman, Towler, blackmails them.