Deadly Obsession

A professor of psychology at a prestigious university has a dark past that is the basis of her interest in psychology.
A serial killer abducts a teenaged couple, takes them to his private torture chamber & strips, tortures, rapes them. The girl escapes. When she tells her horror story to detectives, she is sabotaged by her mother who tells them not to believe her daughter's tall tale, "She's a habitual liar."