[6] Following this, Vox, in 2000, and Cobra introduce a trio of officers of the Brigade criminelle (French criminal investigators) led by the commander Alexandre Bruce.

She was presented with the Elle magazine Grand Prix des Lectrices in 2005 for Passage du Désir (translated into English as Dark Angel[9][10] In 2007, the Sylvain rewrote her first book, Baka !, further developing the character of Louise Morvan.

[11] The detective later played a major role in Sylvain's La Nuit de Geronimo, a novel which intertwines dark family secrets, unethical research in molecular biology and GMOs.

In the short story compilation Régals du Japon et d'ailleurs, Sylvain temporarily moved away from crime fiction, reminiscing on the gastronomic experiences of her youth and her travels.

I,In 2013, Sylvain contributed to the short story collection Femmes en colère along with Didier Daeninckx, Marc Villard and Marcus Malte.