Imagine you are walking late at night on the street with no people in sight. Then you hear footsteps behind you. Would you walk faster or even run since you fear the person behind you? Or would you consider the person as a harmless person like you and slow your walk to the same speed? This book is not created to tediously arrange a list of dreadful crimes. It is a book created to help people to identify criminals by looking and observing their behaviors.