When Katie finds out that her increasingly unresponsive legs and extreme fatigue is due to Multiple Sclerosis, she rides an emotional rollercoaster – anger, denial and fear – when faced with a wheelchair-bound existence. She puts her studies at Oxford on hold, and she splits up from her fiancé, Mark, even though she still loves him. While undergoing treatment, Katie is diagnosed with MS2 – a virus that paralyses the mind. In hospital, Katie has to cope with her irritating bedfellows who argue constantly, and where she is treated by Dr Andrews, a handsome psychologist. The closer she gets to him however, the worse her pain becomes. Compounding Katie’s struggle is Mark, who returns to her bedside day after day. Once Katie begins Dr Andrews’ new experimental MS2 treatment, Mark can’t recognise her anymore. He begins to wonder if Katie will ever be cured.