For as long as she can remember, Sabine has lived two lives. Every 24 hours she Shifts to her 'other' life - a life where she is exactly the same, but absolutely everything else is different: different family, different friends, different social expectations. Determined to live one life, Sabine begins a series of increasingly risky experiments which bring her dangerously close to the life she has always wanted... But just what - and who - is she really risking?.