Who is Alice and Ariel from Without Conscience: The Disturbing World of the Psychopaths Among Us and what is their importance?

Alice and Ariel are two twin sisters that could not be more opposite. Ariel is a successful lawyer and extremely intelligent. She was always an overachiever and great student. Alice on the other hand is a criminal and drug addict. She began exhibiting aggressive and violent behavior at a young age, and has been a financial and emotional drain on her family. The study of twins helps to bring up the question of whether psychopaths were born crazy or just plain bad.