Everyone's a little worried about St Helen's Hospital. In many ways it is a miracle of the modern NHS. It has plenty to offer its patients. The problem is that a lot of them keep dying of natural causes in the night. And no-one can find the bodies.

People are beginning to notice. Questions are being asked. And there are rumours — the strange whispering figures seen at the end of the corridors, the electrical buzzing, the screams.

Also, Rhys Williams has come to visit his mother. Brenda's had her hip done and is looking forward to a bit of rest and regular crumble. Rhys and his mam are in for a night they'll never forget.