"Sue and her brother, Eddie, are visiting London when they run into a little problem. They can't find their tour group. Still, there's no reason to panic. Because there's no way their tour guide would just leave them. All alone. In a gloomy old prison tower. There's no way they'd get locked inside. After dark. With those eerie sounds. And a strange dark figure who wants them ... dead"--

Gary's dream is about to come true. He's going to exchange bodies with another kid for a whole week but the new body isn't human.