Nigerian crime is synonymous with cyber crime, and variants of the original so-called 419 scam. These are emails where the suspect claims to be a prince or princess without access to their riches, and promise to share their windfall if we help them out financially. The victim's bank account is then emptied and the suspect is never heard from again. Our guest is a journalist who has spent years uncovering the massive scale of a Nigerian mafia that dominates parts of Marseille and is globally connected. A new book called "Mafia Africa" is the work of Célia Lebur from French news agency Agence France-Presse and Joan Tilouine, the head of investigations at Africa Intelligence. Célia spoke to FRANCE 24's Gavin Lee about the book.