Cassie (Hannah Murray) can trick everyone. In her magical world the skinny bonkers girl still manages to fool everyone that she’s beating her eating disorder. Her parents Marcus (Neil Morrissey) and Margeritte (Naomi Allisstone) are well and truly duped. But Sid (Mike Bailey) isn’t. Good old geeky Sid who inadvertently steps out of Tony’s (Nicholas Hoult) shadow to win a place in Cassie’s heart by being the only person to possibly notice and care what happens to her. The only person except Allan (Alan George), the taxi driver who takes her to the clinic and who is the only adult she trusts – and the only person to ever see her actually eat anything.