Read an excerpt from the book 'Life After Darkness: Finding Healing and Happiness After the Cleveland Kidnappings,' by Michelle Knight, now known as Lily Rose Lee.

People are trading bitcoin for goods and services on the illegal marketplaces of the dark web, where the easy, instant flow of the cyptocurrency allows users to tap into their darkest natures--all from the anonymous comfort of their home computers.

Why do so many killers—Jeffrey Dahmer, Ted Bundy and David Berkowitz to name a few—abuse animals before targeting people? An expert provides insights on how the two behaviors are linked.

Over 20 years later, Dr. Stuart Hart, a child psychologist and expert defense witness in the trials of Erik and Lyle Menendez for the 1989 shotgun murder of their parents, still believes the brothers were abused.