Her first novel Finding Violet Park won the Guardian prize and was followed by Broken Soup, The Ant Colony, The Double Life of Cassiel Roadnight, the Carnegie shortlisted Fire Colour One and Us in the Before and After, as well as Iggy and Me, a series for younger children and the middle grade trilogies A girl called Joy and Daisy Brewster. Her work has been published in 19 countries.  In 2017/18 she was the Hay Festival International Fellow, spending the year meeting and learning from teenagers