Jealous of his independence and disgusted by her experience at a major law firm, Valentine, an ambitious Brussels lawyer, has created DE FACTO, a firm specialised in cybercrime cases, helped by Théo her legal intern, a geeky hipster passionate about IT law. She recently recruited top computer scientist and hacker Fran who turns out to be her half-sister. They still do not know each other and bit by bit, they will discover their complicated pasts