Gary Leon Ridgway, who raped and murdered more than 49 women, was obsessed with deviant sex and visiting prostitutes. This, combined with his aggression and violence, were significant driving forces behind his murderous actions, says Mary Ellen O'Toole, a retired FBI senior profiler who interviewed Ridgway.

Karin Ahrman, who has a 13-year-old son, received a flyer in her mailbox notifying her that a registered sex offender had moved in a few houses away. She talks to us about her fight to inform her community about their need for vigilance against sexual offenders.

Linda Fairstein, former sex crimes prosecutor, and Cynthia Calkins, PhD, a forensic psychologist, on how we can protect our families from sex offenders.

Linda Fairstein talks to us about her most memorable unsolved case, what concerns her about how sexual assaults are handled on college campuses and how she is often inspired by real-life events in her books.