Gwen finds herself being hunted by a sorceress from the past for a 'gift' she doesn't know she has.
Morgan Le Faye, an old sorceress from an old tale, is dying. But over the centuries she has been secretly working out a way of escaping the bonds of history and time to get what she needs from the 21st century to survive.
Gwen Barlow thinks she is just a normal 13 year old girl. But she comes from a family with special ‘gifts’. Unbeknown to her she possesses a power to heal, absorbed from playing with a slate pendant that her eccentric Grandmother has given her.
Plagued over the year with unexplained strange happenings, Gwen finds it all comes to a climax when she attends a school camping trip to a Welsh slate mine. When a midnight prank with friends goes wrong, she finds herself in hospital and unwittingly fulfilling exactly what Morgan has been plotting to happen.
In a confrontation at school between Morgan and Mervin the strange man from the Welsh camp who knows far more than he is letting on, Gwen finds herself trapped inside an ice dome and in time. There she finally accepts what has been happening to her and manages to control her ‘power’ to escape from Morgan’s clutches.