When you're with Geronimo Stilton, it's always a fabumouse adventure! I am not the kind of mouse who spends money on useless things. But one day I kept getting packages of things I did not order or need. Someone on the Internet had stolen my identity! Professor Margo Bitmouse, a well-known computer expert, helped me track down the hacker. Could I find the thief before my reputation was ruined?