Drugs Are an Indicator of Unhappiness Jim lets himself be tempted by narcotics, an underworld gravitates around them. This world perhaps prohibits an attraction, certainly a need to differentiate oneself from others. Do we undoubtedly commit suicide by devoting ourselves to artificial worlds? Smoking a joint or a 'tarpé' is surely an expression of freedom. Drug addiction is often the path taken by these smokers of badly rolled cigarettes. Addictions can be numerous, repeated consumption of a product - tobacco, alcohol, drugs - can lead to a loss of control over consumption, we lose our freedom of choice with regard to the product. Disruptions in family, social or professional life may result. Today, other behaviours can be considered addictions, such as games and time spent on social networks, at the time my story is set, the digital world did not exist. One day, Jim witnesses a murder. Some young people murdered one of his friends who was a prostitute. They don't want him to talk. These young people have a North African origin. We are in the '70s, we were not talking about Islam, Islamism, Islam leftism, Islamophobia. This is ordinary violence. The explanation for delinquency is linked to the personality of the officer and not to his ethnicity or religious beliefs. The exogenous causes of delinquency are known, we can cite inequalities and social origin, economic development, poor countries experience less delinquency, urban type, large housing estates, promiscuity favours crime. We generally oppose this with endogenous causes, what is due to the personality of the offender, what comes from heredity, family, illness or morphology. For Lombroso, the criminal is an abnormal person, biological or morphological causes explain his deviance on the path to crime. The multiplication of causes which leads the agent to commit an offence can lead to an error of interpretation. The difficulty of determining the main cause of the criminal act leads to seeking the reason for the behaviour in religion. This book is also the story of a sordid crime, it is a detective book, we do not encounter a Hercule Poirot there. We are far from a work by Agatha Christie. It's just a crime that disrupts a budding story.