La Disparue is an interactive and immersive police investigation from a first-person perspective. The user has to help inspector Harry to solve a strange case. A young woman called Kacey Harnois, was assassinated 6 months ago. The case has not been solved. A second woman has just disappeared and the two affairs seem to be linked. Our project is a hypertext fiction. The hypertext is the key to progress in the investigation. The user has to find it by looking for clues and solving puzzles, while trying to save the young woman’s life.