Los Angeles is a city of reinvention. Many come to start anew, to strike it big. Many kill the person they once were, the person they left behind. And in turn, someone else can turn around and kill them, too--permanently. A housekeeper enters a secluded, upscale home and discovers two bodies floating in the The heir of an Italian shoe empire and an unknown woman. The house is untouched, but a "double" in Bel Air certainly makes this case stand out...

When he begins receiving packages containing useless things he did not order, Geronimo Stilton discovers that someone on the Internet has stolen his identity, a dilemma that compels him to enlist the help of computer expert Professor Margo Bitmouse, who helps Geronimo track down the hacker.