What must happen for people to cross the final boundary? Time and again, we hear about rampages, extended suicides, incomprehensible acts of violence in relationships, and bizarre murders commanded by voices in the perpetrators' heads. In disbelief, we try to understand how such things can occur. Why do seemingly normal people suddenly go off the rails? What must be going on inside a person for natural inhibitions to be broken? Based on new findings from brain and aggression research, this book reveals how personal threats can cause extreme reactions, how people find themselves in exceptional situations, and which illnesses have severe effects on the psyche. Dare to take a look into the multifaceted inner world of those who have seemingly crossed insurmountable boundaries.