Grace and Tippi are twins. Conjoined twins. And at the age of sixteen, their life begins to change. No longer able to be home-schooled, it's time for them to join society and for them to see the world. And for world to see them. For the first time ever, they have real friends. Pe...ople who take them for who they are and accept that they are just like any other teenagers. They smoke, they drink, they argue, they laugh, they cry, they fall in love. But what neither of the twins has told anyone is that Tippi keeps fainting. With Grace being the weaker twin, Tippi has been supporting them both. But she can only sustain this, and their secret, for so long. As Tippi's heart begins to fail, the girls must make the life-changing and heart-wrenching decision to separate. Will either of them survive the surgery? And even if they do, how do they face a life apart? Sarah Crossan tells a moving, perceptive and beautifully crafted story which has the power to make you laugh and cry.This is memorable portrait, not just of two sisters and their journey, but of a whole family balanced on a knife edge. One will stay with you long after you've finished it.