The drama series tells the story of Kate (portrayed by Genevieve O'Reilly) who has awoken from an 18-year coma to find the world that she once knew has slipped away.
Initially she is unable to come to terms with the fact her parents are older and her friends look so different, but as the weeks go by she adjusts to a world with the internet, mobile phones and global companies.
For their part, Eileen (Geraldine James) and Toby (Robert Pugh) are pretending nothing was awry.
However, Kate's life will never be resolved until she discovers the truth of why she was assaulted at the school leaving party 18 years previously.
Kate needs to know why she survived and her fellow school pupil Brian Wellings was killed.