SHE WAS SENT DOWN... Cara Lockhart has just commenced a life sentence in HMP North Fern - the newest maximum security women's prison in the country. She was convicted of a crime she is adamant she didn't commit. SHE WAS SET UP... One morning she wakes up to find her cellmate murdered - shot in the head with a gun that is missing. The door was locked all night, which makes Cara the only suspect. BUT THAT WAS JUST THE BEGINNING. Cara needs to clear her name, unravelling an impossible case, with an investigation governed by a prison timetable. But as Cara starts to learn more about North Fern and the predicament she is in, she finds connections between the past and present that she never could have imagined. Indeed it seems that her conviction and her current situation might be linked in very strange ways...