After falling asleep in a London Tube station, Franka Potente wakes up to find her last train gone – and she’s locked inside the station.

That’s bad enough, but then a bloodthirsty something or someone starts stalking her…

The plot is the usual chiller fare and it does become more and more far-fetched as it goes on.

However, the film uses its creepy setting to great effect and gains immensely from its location filming on the real Underground system, delivering plenty of scary thrills and spills as Potente runs for her life.